You've gotta love the clowns, esp. percs and false percs., gobies are good too, and once the tank is est., a scooter blenny is an interesting tank resident, esp. the red ones. Also, look into the cardinalfishes, they are quite intriguing, as are the small flasher and fairy wrasses. Grammas are also cool for smaller tanks. The only thing about angels is that they may pick at corals, and the bigger pygmies like atleast 50gal. but you might could get away with one, I would recommend the cherub angel. remember not too exceed around 6-8 small fish, lest the tank get crowded.