I've kept various types of flasher wrasses, yellow shrimp gobies, dwarf angels, purple firefish, and both yellow and green coral gobies in my 65 over the years. The flashers are beautiful fish, especially if you can keep a school of them, same with the purple firefish. The clown gobies are particularly neat in a mixed reef, as they will perch in branches of SPS or LPS corals - they are said to graze some on SPS polyps however, so be aware of that. Personally I've never had any issue with the grazing.