I need help with my fish, I got a 20 gal High tank and the person gave me some fish with it wich include a Snail (which is pretty big), a pleco, a cory and about 13 Dwarf Jellybean Cichlids. I know there are to many fish in my tank and I want to give away (or sell) some but I wanted to know how many should I keep. Also what other kind of fish could I keep with them? I have a Red tailed Shark which needs a biger tank. :?