Dsb's work, what makes them work best?

Okay, what makes DSB's work best ?

1A >> EDUCATION ! ! This thread is a good place to start, but sources abound.

1B >> Understand the WHOLE SYSTEM CONCEPT ! ! There is no "MAGIC BULLET". No concepts or equipment need to be considered valid, only in "MUTUAL EXCLUSION" ! ! !

Determine what your system is going to be. There are many types.

Understand your "Whole System", including the sand bed, the auxillary systems, the equipment, and how they work together.

1C >> Use "GOOD EQUIPMENT" Research everything before you buy it ! That includes the tank, the lights, the substrate, the animals ESPECIALLY, the food, THE PUMPS, everything ! Buying "cheap" stuff is much more expensive in the long run.

Determine what the quality items are. Check around for the best price on the specific item, and CONFIRM the quality from the specific vendor.

Buy "big" ( the whole system ), IF you can afford it. Buy small enough, that you CAN afford ALL OF IT ! ! ! ( including the "upkeep" ) Calculate your initial and upkeep costs ahead of time. If this is a problem, start with a 55 gal. . They are "RELATIVELY" inexpensive, and large enough to be reasonably stable for water quality.

OKEY-DOKEY , The STANDARD MIXED REEF ! ?

There IS NO SUCH THING ! ! ! ! ! I'll take a shot at it anyway :D :D

2A >> Determine the animals you want to keep. Read a lot and discuss it with everyone, until you are comfortable.

2B >> Pick your size of tank, consider your auxillary equipment, where it goes, How you hook it up and service it.

2C >> Get ready to be PATIENT ! If you can't handle this part, STOP NOW, and set up a Carribean cruise or something. You don't need that "Aquarium Money" anyway ! :p :D If you have a lot of money, you can "read-up" while you relax. :)

So what is a Standard Mixed Reef ? I don't know of any definition, so I'll offer one here, kind of "off the cuff".

Substrate of some kind, live rock, COMMUNITY fish ( for the most part ), Reef lighting, Softies-LPS, Sand animals, Maybe some SPS eventually( after you get the hang of it ). Auxillary equipment.

An "SPS DOMINATED" tank, IS NOT a "Standard Mixed Reef" tank. If this is your primary goal, you should at least take a serious look at "Bare Bottom Set-ups".

3A >> Pick your "Substrate System". ( you have to decide before you can proceed ) Your options:

--->> DSB of course, generally considered to be 4 or more inches of "Oolitic" sand. Some people like to be more specific about the exacting grain sizes, and possibly with some merit. I like 6" minimum for depth ( and longevity ), along with "some larger grain" at the top to avoid "storms. We can discuss this requirement forever I suppose, and probably will, for at least a long time.

--->> Standard Plenum, described in detail by Bob Goemans in his "little book" or "huge CDrom", as well as by Julian Sprung, and I don't have the reference for that at the moment. Both offer a similarly prescribed setup, that includes 4-5" of 2-4 mm gravel on top of the "plenum plumbing".

These are not difficult to set-up, but can only handle a "LIGHT BIO-LOAD", and "NO SAND SIFTERS ALLOWED", at least as described by Bob Goemans, and for this reason, I personally do not reccomend them. I believe the grain size, is "just too large".

--->> Wasting Plenum. This is my favorite of course, which I have made known very many times. I happen to believe that it is the best option, albeit probably not the "simplest", and it remains "experimental" at this point regardless. I have one in my 27 gal., but not "wasting" yet, and will have one in my 200 gal. set-up before long. Both are experiments, but at worst, I can just "not drain", and I'm running a nearly conventional sand bed anyway, so no harm done.

3B >> Lighting, Get this figured out now. Sure you can upgrade later, but what are you going to do with the original lighting, or the money you don't have any more? you have lots of options here, and MH is not necessary for the Standard Mixed Reef. Go investigate.

3C >> Live rock ( ROCK ). To some degree, how you proceed here is a matter of patience and "fortitude". Many options here.

--->>IF you want some very special shapes and caves, you may want or need to "MAKE YOUR OWN", at least for the special pieces. If so, START NOW. These rocks can require more "curing" than live rock, depending on their "make-up", and are often times used at or near the bottom. There is a lot of information here, at Garf.org, and elsewhere on the net.

--->> "Base rock" ( dead rock ). In most cases, with all the patience you now have, 70 to 80% of your rock can be base rock which is very much cheaper, and easier to cure than "live rock".

It still needs to be porous, and come from the ocean, not "mined" from "dry" deposits, as this "dry mined" rock is usually very high in Phosphates, and we need to start out right here, don't we ?

3D >> Aquascaping. This one is a "BIGGIE" I can't say enough here, This where you make or break the system, "right from the get-go", in my opinion.

--->> ALL ROCKS should be elevated above the sand by 1 to 2". This can be done creatively, to avoid the "floating in space" look.

--->> Also, the "big reef wall" to the back of the tank, has fallen out of favor recently, and so much the better. Keep flow spaces between your rocks, leave a lot of room for fish to swim, and keep a good amount of "beach" for your viewing pleasure, and the animals that "need-love" it ! ! ! Take a look at Npaden"s tank. His is a bit "severe" in this respect, but his tank runs very nicely as well ! !

3E >> Cure your rock. Fill your display tank at the same time, and add a small dose of "live sand" at the same time. You can get some from Inlandaquatics.com and various other commercial sources, as well as from your LFS, or better yet, your "buddies" tank. 5% of your total amount is plenty. Put one live rock in the tank, and the bacteria cultures will remain fed.

--->>There are many ways to do this. Do some research. My favorite method is to cure the rock in a large tub, with a power head, heater, and lights 24/7. this gets it done fast, and promotes the same kind of life in and on the rock, that will continue to be "happy" in your tank. ( Get 2 Seachem Ammonia detectors for $4.00 ea. Watch them for a while, what "fun" ! ! )

--->> It also allows you to find, capture, or trap certain hitchhikers, in your rock that you don't want. It further keeps unavoidable "build-ups" that are going to occur during "curing", in the tub, and out of your tank.

--->> Throw in plenty of crabs and snails. This would be about 1 snail per gallon. Get a wide variety of snails. For crabs, investigate, there is a lot of controversy about crabs. I would say about 1 crab for every 4 gallons, blue legged hermits, if you can't decide otherwise. These crabs and snails will mow down the algae that starts growing in very short order.

--->> If the crabs and snails are winning against the algae, then you are OK, else wise, change 50% of the water. Check the Ammonia detector.

3F >> Put your live rock in the display tank. After a couple of weeks or when the ammonia detector drops to "warning", you can start adding the rock to your tank. After the detector says "safe", you can add A fish ( or two ).

--->> Now it is time to watch for Nitrates to rise and fall. this is your continuing obligation, until Nitrates fall to a level that can support your animals. Most people consider < 5 ppm to be adequate for most animals, but not for SPS to be sure. At this point you need to start monitoring Phosphate, and this is where the fun REALLY BEGINS ! ! ! ! ! ! ! ! !

Yeah but what about all that "OTHER STUFF" ? You mean Kalkwasser and Calcium reactors, and refugiums( pod factories ) and turf scrubbers, and SKIMMERS, and heaters, and Phos reactors, and Nitrate reactors, and . . . . . . .

4A >> The "other stuff". OK.

--->> Heaters. Buy high quality heaters of course, and two of them at a minimum, regardless of the size of the tank. You did research didn't you ? ?

--->> SKIMMER. This is another "BIGGIE". ALMOST no one advocates running a reef tank without a skimmer anymore. Of course there are exceptions, but in a "Standard Mixed Reef" tank, I think not. Buy a VERY good appropriately sized skimmer.

--->> You will need to maintain Calcium and Alkalinity, I don't believe in hoping for "buffering" from the substrate, so, you've got additives, Kalkwasser, and Reactors. Research.

--->> Refugium. I believe that refugiums for "pod and critter" production are very helpful if you are keeping "sand animals". You can also grow some Chaeto, and/or various versions of macro algae, for Nitrate, and more importantly, Phosphate removal purposes. Just now, I prefer the Chaeto.

--->> The "turf scrubber" or "Algae tray" per PaulB can be valuable as well.

4B >> then there is the rest of "the stuff". Well, you are going to have to get back into the research, and apply that to how YOUR PARTICULAR TANK is "running". No "Magic Bullets" in this Hobby.

How is that for a starter? You mean I didn't mention High Flow, "Vodka Dosing" or something else?

How big a "buffer" do you think RC has for these "replies" any way? ? ?

Let's "chew on it" heh? ? >Barry :beachbum: :thumbsup: :wavehand: :hammer:
 
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Great summary Barry, now this is some SB info everybody can benefit from. Great job on this thread Barry and Curt.
 
Gee WHIZ-Z-Z-Z-Z-Z-Z-Z ! ! ! ! !

How did I leave out RUGF ? ? ? I don't know, I must have had visions of Wasting Plenums "dancing" in my head. RUGF systems certainly can work quite well, Although the "Specific" recipe isn't yet known. COME ON PaulB ! ! ! With an appropriate substrate composition, grain size and depth, a RUGF can function very nicely. The combinaton does need to be "gotten just right", and some experimentation could confirm a "model set-up".

Once this were found, it would probably be the easiest system to setup, albeit maybe not quite the best.

I am looking to PaulB currently, for setting one of these up, for a predator tank I would like to get going very shortly.

A RUGF is similar to a Wasting Plenum, but still quite different in operation. I am proposing a .0037 gal. per gal. per day wasting rate for the Wasting Plenum.

PaulB is using something close to 45 gal. per gal. per day rate of flow. That is approximately 12,000 times the flow, per day through a Wasting Plenum. Kind of interesting huh ? ?

> Barry :) :)
 
I was browsing through your Wasting Plenum option thread and couldn't find the CAD drawings to the design, have you got around to making those?
 
Just click my "gallery" icon. There you will see a 55 gal. version that should be very effective. I have a modified version I'm working on that won't have the "restriction plumbing" up "above" the main feeder tubes.

The Particle migration Graphic, and the original plenum that is in my little hex tank are in the "plenums and controls" album.

> Barry :)
 
OK, just got done reading this thread, the whole thing :hmm4: ! Started last Thursday and made my way through carefully and thoughfully. You guys did a great job at keeping this thread informative, on topic and not full of flames and bullets (which is why I stayed with it). I'm going to set up a new 90g "mixed reef" and have been doing an immense amount of reading on the subjects of DSB, BB, refugium, plumbing/sumps etc etc ... I'm currently moving from a 55g with no sump, HOB skimmer, 100#s of LR and a 5"DSB. I've had this system since 1995, started with crushed coral and switched to a DSB in 2000. I'm not going to get into the livestock here but stay on topic about the sand substrate. All parameters were always good throughout the life of my DSB until recently, the nitrate started to go up (to about 50) recently. I broke the tank down and put everything into a 20g (put some of the rock in buckets with pump, heater in the garage) because we were having our floors done, and thought it would be easier to keep everything in the 20 for now (only one fish - Maroone Clown). When I was breaking everything down and pulling out rock, I noticed a significant amount of sludge coming out of my rock. I wonder if this could be the source of increasing nitrates. I'm confused as to why the NO3 accumulation happenned now and not before and thought that my DSB and LR were at "saturation." I had never dealt with a horrible algae outbreak before but started to get some cyano on the glass, rock and DSB. I upped the water change frequency, siphoning out the stuff to keep it under control. What I'm wondering is:

maybe breaking down a system after a period of time when nutrients (NO3, P) start to increase and "cooking" rock and replacing the sandbed isn't such a bad idea. Things were good for so long, then bit by bit, the NO3 rose (no change in load), some minor problems began and mechanical maintainance increased. In the old days, we used to break down the system and siphon under the UGF. Maybe, because we like our DSBs for the variety of reasons listed in this thread, then we need to replace them after a period of time, thus exporting the stored or build up nutrients that are deep in the anoxic zones of our DSBs. And do this before they "burb" or "purge" and cause a "crash." Same thing with our rock. I couldn't believe how much stuff was in the rock and is still coming out of the stuff in the buckets in the garage.

My plan:
-going to completely clean the rock of all dead material (I don't like the term "cook", but by it's definition is what I am doing)

-add completely new DSB to my new system

-add a refugium, both in the display via a small rubble pile (and be sure to have good current run over this) and in the sump, where I'll also grow some cheato.

-run a good skimmer in the sump

-slowly add things as water levels dictate

So, I'm starting with a "clean system", using a DSB to help with NO3 breakdown, skimmer and growth of algae to help with nutrient export, good husbandry to not overload the system, lots of critter cause I like 'em!

I'm going to mix my substrate with aragonite and smaller sand particles. My old DSB which ran very well over 5 years still had pieces of crushed coral in it, so I don't think a small portion of larger sized granules is bad.

All of these decisions were made because of reading this and related threads.

Any thoughts on replacement or need to replace the DSB as a form of nutrient export after a period of time? The problem lies in WHEN is appropriate and HOW to do this with minimal disruption to your system.

Pete
 
<a href=showthread.php?s=&postid=6625445#post6625445 target=_blank>Originally posted</a> by barryhc
Just click my "gallery" icon. There you will see a 55 gal. version that should be very effective. I have a modified version I'm working on that won't have the "restriction plumbing" up "above" the main feeder tubes.

The Particle migration Graphic, and the original plenum that is in my little hex tank are in the "plenums and controls" album.

> Barry :)

TY Sir :rollface:
 
<a href=showthread.php?s=&postid=6625506#post6625506 target=_blank>Originally posted</a> by Trigeek
OK, just got done reading this thread, the whole thing :hmm4: ! Started last Thursday and made my way through carefully and thoughfully. I'm going to set up a new 90g "mixed reef" and have been doing an immense amount of reading on the subjects of DSB, BB, refugium, plumbing/sumps etc etc ...
Good job Pete !

I'm currently moving from a 55g with no sump, HOB skimmer, 100#s of LR and a 5"DSB. I've had this system since 1995, started with crushed coral and switched to a DSB in 2000. I'm not going to get into the livestock here but stay on topic about the sand substrate. All parameters were always good throughout the life of my DSB until recently, the nitrate started to go up (to about 50) recently.

What was the Nitrate level when it was "good", and Phosphate if you know. Be excruciatingly honest, it will help us all ! :)

I broke the tank down and put everything into a 20g (put some of the rock in buckets with pump, heater in the garage) because we were having our floors done, and thought it would be easier to keep everything in the 20 for now (only one fish - Maroone Clown).
Get one of those Seachem Ammonia detectors for $4. It might save your Clown.

When I was breaking everything down and pulling out rock, I noticed a significant amount of sludge coming out of my rock.
Was your rock buried in the sand? Aquascaping? "Sludge" really sounds severe. Then again a lot of sand beds don't last six years. Some last a lot longer as well. Many consider 6 years one heck of a success, but in the spirit of this thread, yes, we want to do much better. Also, what was the sand like, particularly where it was NOT under or right next to the rock. "Sludge", black "yuck", etc. ? ? ? Did you have "High Flow" ?

I wonder if this could be the source of increasing nitrates. I'm confused as to why the NO3 accumulation happenned now and not before and thought that my DSB and LR were at "saturation."
It sounds like you are exactly right.

I had never dealt with a horrible algae outbreak before but started to get some cyano on the glass, rock and DSB. I upped the water change frequency, siphoning out the stuff to keep it under control. What I'm wondering is:

maybe breaking down a system after a period of time when nutrients (NO3, P) start to increase and "cooking" rock and replacing the sandbed isn't such a bad idea. Things were good for so long, then bit by bit, the NO3 rose (no change in load), some minor problems began and mechanical maintainance increased.

This really sounds like an "overloaded" system. Cooking rocks is certainly in order, hard telling about the sand at this point. With new tank etc. , new sand bed is most likely very appropriate.

I don't think that replacing the sand bed needs to be a necessary eventuality. but in this case, go for it.

Your plan sounds like a good one. I, of course, would install a wasting plenum. If it doesn't work out right, just quit wasting and it is A DSB by default. If not that, I, would use a Reverse Under Gravel Filter, like I'm a week or two short of doing for my Predator tank. Check with PaulB if he doesn't give us the "recipe" first.

Else wise does as you're planning anyway, use higher flow with your better skimmer, and be a little more stingy with the food. If you got 6 years last time, you might make it 9 or 10 years this time, and that sure sounds like success to me.

Let's see if Curt has several opinions here. He has been at this much longer than me. Many other posters here will be having considerations to offer as well.

Happy Reef Keeping > Barry :beachbum: :thumbsup:
 
Barry for the RUGF that I have I got out my ruller for this scientific measurement. As you know that gravel has been in my tank since it was a brackish tank in the sixtees so a lot of the grains I am sure fractured but it seems they range from 1/8th inch to 1/16", Like I said, there is a lot of smaller sand grains in there due to adding material and the boring of the animals themselves on the rock. I think crushed coral may be a little too large.
I have 3 UG filter plates in a 6' long tank. All three tubes were bent where they emerge from the gravel and travel at the bottom of the tank to go up at one side at the rear. They enter the bottom of a plastic container about an inch above the water which is actually an old hang on filter. The water enters the container from a submerged powerhead which pumps 450 gal/hr.
The powerhead is upside down near the surface with a sponge on the intake. I did this so I can just remove the sponge for cleaning without hardly getting my hands wet.
You will not get nitrate reduction until some detritus forms in between the grains and slightly reduces the oxygen. You know about the skimmer and algae trough.

Good luck.
Paul
The green thing next to the rusty fan is the container where the tubes enter. (give me a break, it's old)
You can see the sponge at the surface.

13094Reverse_UG_filter.jpg
 
<a href=showthread.php?s=&postid=6625975#post6625975 target=_blank>Originally posted</a> by barryhc
Let's see if Curt has several opinions here. He has been at this much longer than me. Many other posters here will be having considerations to offer as well.

LOL....I know what I do by doing it WRONG the first time. :) Let me share one of my favorites. I'm sure you'll get a chuckle out of it.

Quite a while back, some people came up with the idea of of moonlights. They weren't available to purchase yet because they were too new. I decided the DIY threads were way too complicated so I set up my own moonlight with a 2 dollar lightbulb socket from Home Depot and a red "Partylight" from Walmart because they were out of blue Partylight bulbs. What could the possible harm be??? LOL

I'm sure you can guess.

Where on earth did all of this cyanobacteria suddenly come from???? I still can't believe it took me two weeks to figure out that the additional photoperiod along with a less favorable spectrum on the ROYGBIV thing might have had an impact. :rolleye1:

Oh well, we've all made mistakes.
 
<a href=showthread.php?s=&postid=6626095#post6626095 target=_blank>Originally posted</a> by Paul B
a lot of the grains I am sure fractured but it seems they range from 1/8th inch to 1/16", Like I said, there is a lot of smaller sand grains in there due to adding material and the boring of the animals themselves on the rock.
1/16 to 1/8 inch is 1.5 to 3mm , which is just a bit smaller than that which is prescribed for plenums. It is not a valid comparison though because standard plenums don't have ANY flow.

I think the smaller sand grains are really crucial to the denitrification capability. How DEEP is your bed Paul ?

The water enters the container from a submerged powerhead which pumps 450 gal/hr.
I'm sure I saw a value of 50 gph each for 3 tubes, in another post, TOTALING 150 GPH. Is the 450 gph a "Typo" ?

You will not get nitrate reduction until some detritus forms in between the grains and slightly reduces the oxygen. You know about the skimmer and algae trough.

If the 450 gph remains valid, then Pauls "daily flow rate" becomes 36,000 times as much as proposed for the "Wasting Plenum".

YIKES ! ! ! > Barry :)
 
Barry,

not familiar with the wasting plenum, any advice on where to find info on this??? I tried searching RC but the search engine wouldn't search.

My parameters were good prior to the increase in nitrates (nitrates always tested very low - 0), didn't test phosphates as I didn't keep many corals (shrooms, leahters) and the ones I had were growing and looked nice. I was very happy with the DSB. Upon reflection, I should have seeded the DSB again with more pods, worms etc. The populations may have depleted leading to an ineffective sand bed. I had seeded it twice previously when I noticed the pods and stuff weren't as visible. They would crawl on the glass and could see them everywhere with a magnifying glass. Even so, I'm glad to break it down and start a new one. Don't like the thought of a build up of hydrogen and sulfer over a period of time.

Pete
 
barryhc - Thanks for pointing me in this direction. I won't read all 29 pages, I read too much during the day :D

Here's how I setup every single DSB.

I use the ESV oolitic and mix it with a bag of slightly larger sized Carbsea and some small CC.

Mixture as follows:

ESV 90%
Small CC 3%
Carbsea 7%

I start the cycle with some shrimp and wait for three months before adding a critter kit. I buy one from Inland, IPSF and Greg Hiller (if available). I feed the DSB for 3 months with nothing but shrimp, fish and pellets. I then add some live sand from fellow reefers in the area or my own system to further infuse the system. After feeding the DSB for 3 months I then add my LR. I then wait another 2 months before any fish and inverts were added to the system.

Couple of points to make...

Dr. Ron has told me that this is the wrong grain size to use for a DSB. I sort of disagree, oolitic sand is spherical in shape. I believe this allows for better gas exchange between the deeper levels of the DSB, which for me averages around 5"- 6" in depth.

I also believe that proper time is required to allow the system to develop and mature. I believe that hobbyists rush the process and force the DSB to process more waste than is possible, thus allowing nutrients to build up and not get exported. I don't believe anyone would follow my setup, it takes 5 to 6 months.

My first system lasted 5 years, before I had to break it down due to a house move. My new tank has been setup using the same method and running for 3 years with zero problems.

I think the systems setup today differ than the ones I setup back in '98 and the impulse to stock it right after the initial cycle does more harm than good.

I've also been playing around by setting up exclusive "bio diverse zones" using a vertical grid method. One of the issues with DSB, certain species can overtake an entire tank and push out weaker ones, making the DSB less diverse. What if certain areas of the tank can be made to mitigate migration and layer domination of a sand layer? I think it would have some benefit. However, this would require a large tank footprint to work.
 
<a href=showthread.php?s=&postid=6634580#post6634580 target=_blank>Originally posted</a> by JerseyReef
I use the ESV oolitic and mix it with a bag of slightly larger sized Carbsea and some small CC.

Mixture as follows:

ESV 90%
Small CC 3%
Carbsea 7%

I am not familiar with ESV. Please tell us ( me ) more. Composition and grain distribution.



I start the cycle with some shrimp and wait for three months before adding a critter kit. I buy one from Inland, IPSF and Greg Hiller (if available). I feed the DSB for 3 months with nothing but shrimp, fish and pellets.

Pellets ?

Couple of points to make...

Dr. Ron has told me that this is the wrong grain size to use for a DSB. I sort of disagree, oolitic sand is spherical in shape. I believe this allows for better gas exchange between the deeper levels of the DSB, which for me averages around 5"- 6" in depth.

I like it !

I also believe that proper time is required to allow the system to develop and mature. I believe that hobbyists rush the process and force the DSB to process more waste than is possible, thus allowing nutrients to build up and not get exported. I don't believe anyone would follow my setup, it takes 5 to 6 months.

I think the systems setup today differ than the ones I setup back in '98 and the impulse to stock it right after the initial cycle does more harm than good.

I think this is prudent. Painful but Prudent. Probably a lot less painful than "Sudden Death Syndrome", whatever that is.

I've also been playing around by setting up exclusive "bio diverse zones" using a vertical grid method. One of the issues with DSB, certain species can overtake an entire tank and push out weaker ones, making the DSB less diverse. What if certain areas of the tank can be made to mitigate migration and layer domination of a sand layer? I think it would have some benefit. However, this would require a large tank footprint to work.

I REALLY like this part ! ! ! I have wanting to do similar in a 6 foot 200 gal., let's discuss this more.

> Barry :beachbum: :thumbsup:
 
Barry, this is a confusing thread, we have DSB and RUGF all at once. Anyway, thanks for clarifying how many mms is 1/8'th inch. I also believe the smaller grains contribute to the denitrificating ability. I remember adding maybe three or four gallons of some type of "live sand" about five years ago for some reason that I forgot but the grains were much smaller. I also think I tested my powerhead once and it is 150 gallons per hour for each tube, I think slower would be better but my present powerhead does not go any slower and it seems to be working correctly due to the zero nitrates so I will leave it so. If I get the time I will remove the powerhead again and test the flow.
The gravel is about two inches deep. This has all been working since Nixon was president (he was after Lincoln) so I guess I will call it a success.
Have a great day (or night)
Paul
 
barryhc

ESV = "Fine Grade" Oolitic Aragonite Reef Sand, which is <0.5mm

This has a spherical shape, which also facilitates more uniform diffusion of water throughout the sand bed. The addition of larger particle sizes, helps to add to diversity, IMO and IME.

Pellets = Fish pellets. Long term food source for fauna.

Sudden Death - I've heard of this, not familiar with it. Might be started with improper setup of the DSB. Not sure.

Bio Zones = I pitched this concept some time back and I remember some people not liking this concept when the "failure" of DSB was being passed around in '03 and '04. They didn't see the benefit. I passed it around to a few people I respected in the hobby (back in the day of the Usenet accounts) and the concept has some hurdles to clear. First, setting grid sizes to support a unique bio zone. Too small and it crashes, too large the diversity never sets in. You also have to prevent cross contamination from each zone. That means no gaps underneath and on the sides of the grid and tall enough to prevent it as well. It's hard one to sell and it needs real science behind it.
 
<a href=showthread.php?s=&postid=6635350#post6635350 target=_blank>Originally posted</a> by JerseyReef
ESV = "Fine Grade" Oolitic Aragonite Reef Sand, which is <0.5mm

This has a spherical shape, which also facilitates more uniform diffusion of water throughout the sand bed. The addition of larger particle sizes, helps to add to diversity, IMO and IME.

Carib Sea has a grade that is .1 to 1.1mm . I would have to check on the shape. Would this be equivalent to "the addition of larger particle sizes" ?

Pellets = Fish pellets. Long term food source for fauna.
This gives me the "eebie-jeebies", a little bit, but I suppose if we start slow and monitor Ammonia closely at first . . . .

Sudden Death - I've heard of this, not familiar with it. Might be started with improper setup of the DSB. Not sure.
That was more humor, than scientific nomenclature.

On the Bio-Zones, I think I was thinking a bit differently there.

My interest, was to create a "zone", that is particularly conducive to Jaw fish, say a 1/4 of 12 sq. ft. area. whatever critters predominate there so be it. Than another "zone", say 1/2 of the 12 sq. ft. for denitrification, and again whatever "critters" come to dominate there. Then a third zone, with much larger substrate, or rubble where small and large pods could hide alond with small and even "larger" shrimp, so that they can avoid predation to some degree. Now the fish get at least some "snacks" as a result.

I didn't intend to place physical barriers at zone boundaries, just different substrates that causes natural selection.

Thanks > Barry


:)
 
<a href=showthread.php?s=&postid=6634834#post6634834 target=_blank>Originally posted</a> by Paul B
Barry, this is a confusing thread, we have DSB and RUGF all at once.
Yeah, I know, I guess I'm "stirring up the sand" so to speak ! But, have we come to a "definitive solution" yet? I don't think so.

I think we've dispelled 1/2 of the "myths", maybe more, and I think that it is just as important that we are acknowledging some of the "potential" downsides to DSB operation as well.

All things have pros and cons, and that is true of DSB, BB, RUGF, airplanes, horsepower, aspirin, orange juice, and G-e-e-z-e, maybe even Plenum Wasting ! :lol: :lol:

Some people will say that their sand bed works perfectly for them, and in many of those cases, I don't doubt it ! Some of them will still be saying the same thing 2 or 3 years from now, and some of them won't.

Come tell us about the successes too, People ! ! ! Some have already, but not that many. The "silent masses" ! :p :D

We started with the question "What makes them work best ?". I think we have made a great deal of progress on that matter. Now we are "digging into" What makes them work "even better" ?

The answers to that messy question, might be a bit "messy" for a while. Progress is often messy, and my associating RUGF with DSB may very well be considered the "messiest" thing of all. Who Knows ?

I hope I haven't shattered anyones Crystal Cage. Mine's Glass, and many are Acrylic. I'm sure they all still have water in them.

None of the above is directed at you Paul. I just go into these "rants" you know ! :D :D

I also believe the smaller grains contribute to the denitrificating ability. I remember adding maybe three or four gallons of some type of "live sand" about five years ago for some reason that I forgot but the grains were much smaller.
I'm quite sure that this is necessary for the best functioning of the RUGF. I notice from some of your posts in other threads, that you let a bit of "mud" go into the tank as well, from some of your "critter collecting" excursions.

I also think I tested my powerhead once and it is 150 gallons per hour for each tube, I think slower would be better but my present powerhead does not go any slower and it seems to be working correctly due to the zero nitrates so I will leave it so. If I get the time I will remove the powerhead again and test the flow.
I checked the Rubble bottom thread, and the value given there is 50 gph "per tube". I'm not trying to be picky here, but I am about to fire up the 150 gal. very shortly, using RUGF, and the difference between 150 and 450 gph is just too much to ignore. Can you take a check ?

The gravel is about two inches deep.

That is very thin by most peoples estimation or understanding, and there is no doubt whatsoever that it is a success ! ! ! I think that the occasional addition of the "mud", along with the critters and live sand are likely "crucial" to good operation at this shallow depth. What do you think Paul ?

Thanks for all your information ! ! > Barry :)
 
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