| I had a royal gramma once in a 10 gal with an A. ocellaris. They were hailarious together. Every once in a while, the ocellaris would swim right over the gramma and the gramma would rear back, open his mouth wide and flare his gills at the clown. But otherwise, they totally left each other alone.
I liked how the clown would wiggle around on top of the rocks and in front of the tank while the gramma would stick to one place and then cruise around the tank and then back to his little spot.
For the nano I'm thinking of putting together next, I'm also thinking about a pistol shrimp/goby partnership. | 
