I have an oscar (about 5-6 inches long), 1 pleco (same size), 1 bluegill (about 2 -3 inches long), 7 cons (smallest is about 2in, its a female, and the rest are males that are full grown, but some have stunted growth because of their old owners), 1 8 inch goldfish (had before i got into fish), and 4 7inch long channel cats. and i have 2 500 AC's and 2 of the cheap wal-mart filters (the 30$ ones). my question is, should i get rid of anything or get any more fliters or what?