What's happened to my tank?

ReefNole

New member
Hi all,

Apologies in advance for the length of this post, but I think the details in the context are valuable and I really need some help.

I set up a 29g last March with 2 HOB filters full of LR rubble and filter floss. The tank has about 30 lbs of LR and 20 lbs of black sand (started dry, now is seeded).

It followed a normal cycle, and was thriving from the 2 month mark to about 3 months ago. At that point, we had a gladiator clown, purple firefish, sixline wrasse, and yellow watchman goby for fish. We had a skunk cleaner shrimp, fire shrimp, and pistol shrimp paired with the watchman goby.

I make my own water and always ensure it is 0 TDS out. I use Red Sea Coral Pro salt and Red Sea test kits. They are not expired.

First, we lost the fire shrimp. Totally random, no signs. Checked water, everything was clear, asked LFS and they recommended "old age" or "just one of those things". Well, then we lost the skunk cleaner, still no indication why. And then the firefish, again, no signs or symptoms. These were all about 3 weeks to a month apart, so nothing wiped them all out.

Well, then we moved, and the move stirred up a ton of silt in the water. However, I monitored Ammonia and Nitrites, and didn't see traces of anything, so I don't think it created a mini-cycle.

And now we're here. Over the last 3 weeks, the tank has grown more and more brown coverings. I thought it was a diatom bloom, because Ammonia and Nitrites were still at 0 and Nitrates were minimal (< 2). However, the brown isn't going away, it's getting worse, and covering everything. And over the past 3 days, my clown started gasping, then his tail started to thin out (no bite marks) and today we lost him.

We still have the yellow watchman, his pistol, and the sixline, but I'm finally thinking these events all might somehow be related, and not one-offs. Up until this point I was thrown off by the duration between losses, thinking if something was wrong, I would have seen a decline before death or multiple deaths simultaneously instead of spaced out. I've attached photos of the tank from today as well as readings from today below. Any help is greatly appreciated.

And as I started this post, apologies for the length but thanks in advance for any support.

Nitrates: Barely detectable. Between 0-2
Nitrites: 0
Ammonia: 0
Salinity: 1.025
Temperature: 79.2
PH: 8.2
Alkalinity: This was my first time testing but it took 2 drops, so I think the card says 0.70?

http://i.imgur.com/KRkmY98.jpg

http://i.imgur.com/AKHXOzz.jpg

http://i.imgur.com/pFmgFXC.jpg
 
Sorry to hear about the problems your having. Losing fish always sucks.

With all that algae in the tank. Your tests are going to show 0. If you have no corals in the tank I would do a 3-4 day blackout to help kill the algae off. Then when you uncover the tank I would do a 25% water change every 2-3 days for about 2 weeks. Then let the tank settle for a couple of days and test the water again. You can still feed the fish during the black out just don't over feed them. Also when you turn the lights back on start off slow and increase it over a few weeks time. Hope that helps. Keep us posted.
 
Thanks so much for the response. What kind of algae is this? It's not hair, bubble, slime, or anything else I've seen. On the sand it's like orange/brown powder.
 
Sorry to hear of your issues. I don't have any input on the deaths, however are you familiar with diatoms? I'm not an expert, but the pics look like diatoms to me


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I've read about them but never had them in this capacity. From what I (thought I) knew, diatoms aren't a result of light or nitrates. And more just "come and go" and most people just ride them out. If that is the case, why would they be the reason for my levels showing low?
 
What test kits are you using? How is the salinity being measured? How and when was it calibrated?


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if you're loosing livestock something is going sideways somewhere... unless i'm mistaken diatoms feed of of silicates, but you're right most people ride them out.

take some water to a local shop and see if they will test it for you

as ugly as it may be at the moment put up a full tank shot.. you never know what may catch someone's eye
 
Test kits are Red Sea Marine Care. Salinity tested using a refractometer. It hasn't been calibrated. I will double check salinity with my LFS and a see about a co-worker's refractometer. He was letting me borrow his phosphate test kit anyways.
 
Well either way that much plant algae activity would indicate that at some point there was excess nitrogen (in whichever form). Likely after the deaths there was nitrogen released. I just read in this article that 7.5 is the highest ph preferred by fire shrimp. http://www.tfhmagazine.com/details/...tank-keeping-fire-red-shrimp-full-article.htm
But it also states that they can adjust to higher. Anyway the ph for the clownfish is spot on so perhaps that is not what caused it. The tail thinning immediately makes me think of fin rot but gasping, i dont think, is usually a symptom. High nitrogen does cause that but assuming the tests are correct (mb check with your friends kit?) Then it is not the case.
Anyway i'm not very experienced so take this with a grain of salt but these are just my thoughts on the matter.
 
Sorry to hear about losing the fish and shrimp! Always a bummer. That sure looks like diatoms to me. That alone wouldn't kill livestock but it could be part of the whole picture. I'm pretty sure you've got excess nutrients in there. Is that black sand aragonite based, or could it have silicates?

Moving a tank and stirring up the sand can definitely cause a cycle, killing fish, followed by an algae bloom. I once moved a 20 gallon across the room but stirred up the sand when moving it. Everything died overnight, so it can happen.

It's easy to think: my tank was fine for 5 months, why have a problem now? I think in some cases your system is kind of going along more on the edge than you realize, and it doesn't take much to tip it over into a cycle and algae outbreak. Maybe phosphate and nitrate was kind of sequestered in the sand, and stirring it up released it all?

I think you can ride this out and things will get better. Up your water changes try and siphon out the algae if you can. Change out the filter floss in your HOB filters daily, add some carbon or phosphate remover, see if that helps.
 
What troubles me is the alkalinity reading.What test kit and what units is it reading in? Alk should be 7- 11dkh.High nitrates or phosphates don't kill fish.Try some water changes. Take your water to your LFS to test the water.Make sure the temp is stable.Temp shock can kill fish.
 
sorry about your problems, it depends on what kits u're using and do you change water regularly?

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Water changes, 20% a week until this passes, and I am worried about that word 'filter floss'. A filter sock, changed every few days, can help, but floss, not changed very often, provides a chance for nitrate buildup. What is the gph (gallons an hour) of your pump? I'd recommend at least 550 gph to get enough circulation. And I take it you don't have a skimmer? That would help remove amino acid build up. Granted you don't have a heavy stock load, it can still get ahead of you with the floss and without the skimming. It's fairly normal to have a diatom or cyano outbreak in a just-fairly-new tank as life really begins to take hold---not all the life is helpful---but loss of inverts and such is not normal.
 
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