I have a 65 gallon angled front freshwater tank, with 4 tinfoil barbs,a green severum, 2 snake skin gouramies, a bala shark, a banded leporanis, common pleco, and one boriealie cichlid. I know i am overstocked but I really wanted to know does a tank NEED a catfish/bottom feeder , or is it ok just by it self?