I've had this tank for about 3 months now. And ever since, I have been doing a weekly 20% water change and gravel vac. Anyway I recently did my water change and gravel vac and within a few hours I notice that my peacock bass were all dark colored sitting on the bottom and extremely stressed. I was really worried that they weren't going to make it through the night! The next morning I breathed a sigh of relief when I noticed they were still alive and acting almost completely normal. I did notice, however, that the tank water was extremely cloudy. It was filled with a white haze that almost prevents me from seeing from one end of the tank to the other. I was freakin' pissed because prior to this water change my water was crystal clear. I didn't do anything different from what I have been dong for the past few months and this BS happens. What the hell happened??!!