No doubt about that-definitely a great addition. A pair will also provide live food for the tank(fish, and some corals), they reproduce quite easily and quite often. They are hermaphrodites, so any two will pair. Both of mine are usually carrying eggs. You could still add a fish alsoFor color and personality you can't beat a skunk cleaner shrimp.
2 royal gramma's....top that....HA!!ROYAL GRAMMA! (HA, beat ya to it QuarryShark )