I'm putting together a 12x12x20 tall unheated tank for the kids. They want a dojo loach, small catfish and some little midwater fish. Sand substrate with driftwood and a few plastic plants. Would like ideas for small ugly catfish (not cories) and mid-top water fish that aren't at petco! I'm having trouble coming up with ideas bc I'm used to 120-300 gallon ideas, not smaller tanks