I've got a 30g with 2 osc. Clowfish, a six line wrasse, and 2 yellow clown gobys and they all get along (well except the 2 gobies). Also had a chalk bass before he plummeted to his death. Check out Igreens stocking list, it will give you a good idea.
http://www.nano-reef.com/topic/74703...-to-nano-fish/