Its been at least 3 weeks since ive been on this site, the main reason being that for 3 weeks i havent had one single problem with my tank.The first 2 months went very badly with death after death, and then white spot etc. The last 3 weeks have been a pleasure, but i have noticed that my water is looking mirky. Up close i cant see any small particles but from a distance its actually difficult so see from one side of the tank to the other. The only change i have made is that i have started to drop in sinking pellet food. Could this be the problem..?