Well, which problem do you have? Mine was diatoms + cyno bacteria, here's the cause:
So, (and this has happened 2 times) the first thing i decided to so was remove and rinse the rubble in my sump. Sucked out lots of detrius and yummy goodness. Once that was clean, siphoned out 3 inches of sand. Tank came with a 4-5 year old DSB
. If maintenance isn't done on that correctly, it can become a nasty nitrate factory (as with the rubble in the sump). Still hadn't fixed the nitrate problem, so i started with siphoning out all the cyno, and performing 30%ish water changes weekly. That got terribly expensive for my 90g, so I picked up some Red Slime
. That will kill the cyno, and turn your tank green for a bit. Make sure you run an airstone if you go this route, as it depletes o2
in the tank. I continued with water changes by-weekly, and eventually the diatoms solved itself.
Fish tanks are all about balance. And patience. You can treat the symptoms temporarily, but eventually you have to get down to the cause.