I already have an African Cichlid tank, so for this one I'm thinking about a species tank.. that is, I want one or two really interesting fish.

For example, I've thought about puffers because they seem to have a lot of personality, but I really don't want to have to do brackish or marine. So freshwater only, please. I also tend to like bichirs and eels, but I'm worried that they won't be very visible. Plus I can only get them as babies, and bichirs at least grow very slowly.

So any other realistic suggestions?