I have a 125 gallon tank with 5 mickey mouse platy's in there, all i know is that the bottom of my tank is covered and when i mean covered you cannot look at the bottom and see a spot with no poo...Its driving me crazy, i vaccumed it last night and today it looks like i never even did it... I have a cannister filter on it but no poo ever seems to make its way there it just falls right to the bottom, anybody have some ideas, I never had this problem in my 55 gallon, i have angels, rams, tetras, cory's serpaes, and the bottom never looks this bad. Oh, feeding is once every 2 days for them so i know i can be overfeeding since there are only 5 fish.