29 Gallon Aquarium Fish. Generally the following popular aquarium inhabitants will feel very comfortable in a basin with an edge length of 30-36 inches. I have a 29 gallon tank.
Here are some other easy and reef safe non-Nemo themed fish to look into that might also interest you and would be fine in a 29 gallon. 2 dalmation mollys 2 tiger barbs 4 platys 2 gouramis 2 goldfish 4 bottom feeding catfish and two catfish that stick to the glass. If you can add a link or picture with your list of fish.
They are very playful in bigger groups and fun to watch.
SeaClear acrylic aquariums manufactured by CASCO Group Inc carry the limited lifetime warranty against leakage. So with a 29 gallon ideally you should have 290gph. I really want some live plants in my aquarium as well. The general rule for tank size is one inch of fish per gallon.