You really should try the chalk bass. Photos don't do them justice. In person the white streaks seem to glow a bit <3 they're supposed to be hardy and peaceful, as well, though mind inexplicably died about a week after I bought him (leaving me unable to add any personal experience to that statement.) To this day I don't know why he died. It was very sudden and he'd been fine all day before I found him the next morning.
Here's my chalk bass. He is peaceful and hardy, out swimming all the time. At feeding time he's a beast! When I got him he was about 1", now he's about 4".
I agree with the Chalk Bass idea. I've had mine for several months and love it. I like Gobies...Rainsford, Randall's or HiFin Red Banded are some of my favorites.