Hmmm, so many choices, the world is your oyster! The dwarf angel idea is cool although I would probably focus on one species rather than multiple in a tank that size....possible breeding? Pipefish are very cool and for the advanced aquarist. There are a plethora of sweet goby species to be had, but many tend to reside in small territories. Fairy/flasher wrasses are pretty awesome. I usually settle on what's cool and AVAILABLE, you can wait a long time if you are looking for something rare and specific. I usually take a trip to a few stores to draw inspiration, nothing gets you more stoked than seeing the fish in the flesh. Don't make me decide for you or you'll have 10 tanks in no time
