it's me again. i have the 80gal. tank. i have 8 cichlids in it. and the water is driving me crazy. like i said in my last post i have been doing this for years and have never had this kind of problem. i have again just checked the water chem. all is very good, i checked nitrite, good, ph, good, ammonia, good.
i have the light on aprox 12 hours a day. i just did (again) a big water change about 50% this time. usualy i do 20% about every 2 weeks. the tank is not by a window. it gets no direct sun light. i do not over feed. the fish seem to be doing just fine no signs of stress or sickness. what now