I am just wondering what happened so I better understand my tank. I have a 46g bow fron with 5 cichlids in there and for the past month and a half the water has been super cloudy. All my levels were in the normal zone, but I couldn't see three inches in the tank. It was bad. I tried several water changes, but that didn't make any differance at all. Then out of nowhere, it cleared up to crystal clear in about two days. I have had my tank running for 6 months now. What just happened?