Current setup is 55g with a penguin 300 and a 10g HOB filter. Currently stoked with 1 Tiger Oscar, 1 Jack Dempsey, 2 Blood Parrots, 1 Algae eater, and 1 Mystery snail. I know its over stocked for a 55g. But I test my water daily and do the water changes when need. It's a lot of work but I don't mind. I plan to buy another tank to move the Parrots to before they all get big. If something happens and I can't I'll just re-home them to a friend.