Is it 2 late to change substrate??

I don't understand what it is that you do not understand. :)

Is that your tank? Are you saying you have sugar fine sand and do not have a problem with it? If so I would love to know how...I love the look but the one time I used it it just kept covering everything in sand dust.
 
I dont understand the problems with the different sizes of substrate.

Do not get me wrong I have experienced it too.

This is what I did (both bad and good)

120:
Put origional substrate in and put rocks on top.
Had fine particles all over it for months.
Constantly blew off the rock during cycle.
Would go in and move sand around to get rid of drifts/dunes. (even as the tank was cycled and was active)

180:
Placed rock and then put in sand.
Started flow during cycle with a 900gph pump set on angle to just move the water around.
Moved some of the orig sand dunes to level out sand. (That is why in my last pic you can see some substrate lines)
DID not touch sand after it all settled out.
Added oolite, orig substrate, fiji pink. At different times.

I do not have any thing that will move the sand. I have snails, brittle starfish. but no gobies or anythnig that will move the sand around from one palce to another.

I have even had an anemone and it's host clown move sand to attach to the bottom of the glass. So YEAH there is a large divit around one anemone, from the clown moving sand.

I am not saying my tank is perfect or there is some magnet under neath it. I just lket it find it's own place and it has stayed there.

The flow is currently produced by two mp40's that ramp up to 80% at different times during the day. I set it to ON which is 100% non fluxuating at least once a week for up to 30 minutes.

The heads are about 6" from the surface and are pointed AT each other with only a 2" latteral difference. This give a bounce off effect that creates eddy's in current not only on the surface but is seen through out the tank. I have them on both sync and anti-sync patterns. They run an hour pattern then switch.
 
Interesting, since I love the look. All I had was dunes, craters and sand storms but I do admittedly tend to go a little nuts on the circulation. :) Not that much off from yours though.
 
If you look at the FTS video you can see a wave in the sand. It goes from left high to center low then back high and a start of a low before the glass. That is natural, by it's choice.
 
That is not fine sugar sand. It looks like aragonite, maybe something smaller but still heavier than sugar grain sand.
 
yeah that looks like aragonite to me also. The sand i have is the fine type of sand, which is why i'm considering replacing it. I just don't want to repeat my cycle over again.
 
Just thought I would add a couple pics to show what I'm talking about..
e8y2abup.jpg



Sent from my Galaxy S 3...
 

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That is very fine and you seem to have a lot of it. I am sure that it will become more settled as bacteria grows in and the finest of the fine particles are removed. I doubt that it will ever become very stable though but my experience with sugar fine was short lived. Putting another layer on top of it might create a deep sand bed which is another topic all together.

If it was my tank I would simply bite the bullet now, get it out and replace it with 1-2 inches of a coarser sand. It doesn't have to be much coarser as you can see in Worms pics. The look is very similar if you like it. Some people swear by sugar fine, some by bare bottom and some people by coral rubble. They all have their benefits and problems but sugar fine seems to have more problems than any of the others. From sand storms to solidifying.
 
...and yes, it does look very glass like. Is that sugar fine aragonite? It looks like quarts or something.
 
Ok, so i know someone who is breaking down an established tank and want's to sell the sand that is in it. if i replace the sand in my tank with that established sand will i have to repeat my cycle?? I'm ****ed now, i thought the sand was going to be Ok and i'm ready to add some fish into my tank..
 
Established sand will start a new cycle if you add it. Clean dead sand will not. You need something to release nutrients to start a new cycle at this point.
 
Established sand = live things which translates to some things will die off and decompose and break down into the cycle. So you will have some sort of cycle if you change to that sand.
 
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