I have a 20 gallon cycled tank and have four male platies and a pleco in it, live plants, too. I want to add a few more fish. First of all, what is the max number of fish for a 20 gallon. I don't want it overstocked. I was thinking of getting two panda cories and the something else. I like Angelfish but I know they should have a larger tank, they are territorial, and they might nip the platies. I don't want to harm my poor little platie boys. What suggestions does anyone have?