I know that product is used by a lot of people but man that would make me nervous as hell putting that in my DT.
Please do not use stump remover. Its purity is not consistent. Potassium nitrate is dirt cheap on Amazon.
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I just went thru the same problem on my 75. I took all of the rock out and put it into a barrel with water pump and cover (holes for air). left it there for two weeks with zero light. During that time i removed all of the sandbed and re-plumbed the system basically redid the build. After i rinsed the rock which was clear of any of what i expect to be dinos and placed back in the tank I am currently running a bare bottom tank until i am comfortable that the problem is solved. prior to the break down the tank had been running for a long time. almost ten years with just two clowns and a couple of leathers lol. Restarting sucks but at the same time its like getting a new tank and kind of re-sparks the love.I think it’s time. Nothing is working. I can’t even get the tank to grow algae at this point. It’s just a massive brown mess. The fish, are happy and healthy by the looks of it. Nothing I have tried, has worked. I know “new tanks” go thru the uglies. But we are talking about a 10 month old setup. It’s not exactly a “new tank” any more. All the corals have died. (3 zoa frags and 1 gsp frag) and more inverts have fallen victim as well. My 90 didn’t do this. It actually had the opposite happen. I had green water blooms that I had to battle.
It’s been over a month since I’ve started this post, with ZERO difference in the tank. I’ve raised the phosphate and nitrate levels. I’ve been doing everything that’s been recommended. Haven’t done any water changes. But it’s just now working.
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I just re-checked your build. I am wondering if your back wall material (spray insulation? is leaching anything. Did you re-seal it after cutting holes for your power heads? I can't think of anything else that could have affected it for that length of time.
Are you planning on ditching the back wall design? Or soaking that for a while and re-curing the rock like the other member suggested?
Stop pouring stuff into your tank. Especially stump remover.
Turn the lights off for 1 day and then turn them on 1 day. Shut lights off 2 days turn on for 1. Basically just mess up the lighting cycle for 2-3 weeks. A blackout doesn’t work because the leftover algae gets its lights back. If you mess up it’s grow cycle it will die. During that time do some normal maintenance water changes.
Are you running both powerheads at the same time?
Try alternating there on cycles so the water that they’re pushing can actually rotate back and with it the sludge