I'm looking for advice on what fish to get for my sons first tank, a thirty gallon in his room. He has no real preference but I'd like to get him something with some personality, that way he is interested enough to stay on top of the maintenance. Anybody have a fish that stays about 5 inches max and is really interesting to keep? I automatically though cons, but I know there is a bunch of smaller fish I've never kept that are as cool if not better. Any advice would be appreciated.