01-31-2013, 12:25 PM #11
One critical point - nitrites are very toxic to fish and 0.5 ppm is high; aim for 0.1 ppm with fish. Also, consider adding an air stone if you don't already have one running - the fish may very well have been injuried by those high nitrites/ammonia levels. Ammonia should be under 0.25 ppm. These numbers are essential to keep under if you want the fish to do well.
Last edited by Cermet; 01-31-2013 at 12:27 PM.