I have a 55 gallon tank and a 35 gallon hex tank. The 55 has been cloudy about six months. Sometimes less than others, but overall, very cloudy. Can hardly see the back wall when looking in the front. I have tried several different water clarifiers and none of them work. The fish are doing fine, so not getting to worried about it, but not real fun to look at. I normally do a 50% water change every two weeks and lately have been adding a 20% change on the opposite weeks. I have two whisper 60 filters, so I know I have plenty of filters. I also have a air pump set up with two air rings. The tank is actually understocked right now. The water tests at no ammonia, no nitrites, and about 5 nitrates. The tank has been set up since this last February and I can only think of about a months time that the water has been clear. The tap water has a great deal of minerals and comes out of our tap white in color. The last couple of weeks I have been doing my changes with filtered water and doesn't make any difference. Please help!!!! The hex tank gets cloudy at times also. Any suggestions appreciated. steph :sad: