So any predators would be out such as lionfish, triggers, puffers and some angels as they would eat shrimp etc. Dwarf angels such as flame angels, coral beauty, lemon peel would work well. Bristletooth tangs like yellow eye kole or two spot would be a good choice. Royal gramma or black cap basslet would also work well. Pretty much any goby or blenny would be able to go in there, but be careful they won't be a snack for some of the larger fish. There's always clownfish, as they normally do well in just about any tank. Later down the road you may even get away with throwing a few anthias in there.