Hazfish, A fish I would highly suggest are Congo Tetras. They are mild tempered, but beautiful, long flowing fins, with iridescent colors. I have 3 , but 2 would be fine. They get up to 4" and seem to be trouble free. I didn't see them described on this site, but you can find them other places.
I am about to make room for a school of Arulius Barbs. I almost forgot about these beautiful barbs. I had 3 of them for over a year and then traded them in when they outgrew my 29 gallon tank. I hated having to get rid of them. I wish I had my 55 gallon back then. Thanks everyone.