I have a 46 gallon bowed front aquarium. It has 2 filter systems in it. A 30/60 dual filter system that goes ALL the way down to the gravel. Then I have a 10/15 that sucks all the top stuff, so I would say its well filtered, maybe I am wrong. I currently have 9 fish, 8 African Cichlids, all dont get over 5 inches big, and 1 Plecostomus. How many more fish can I add to this tank?