Ok, so I have a pair of clowns (that I suspect to be perc/occ hybrids) that have been paired for quite a while and live in a cluster of 5 or 6 BTAs. I recently consolidated my several tanks into a 180 gallon and also consolidated my fish into that tank. There is a lone green chromis (very large, bigger than both clowns) in there that came from an inherited population of fish. Clowns and chromis were put together in the 180 (along with about 10 other fish of various types, everyone getting along very well) about 2 weeks ago (along with the 5 or 6 BTAs which stay in a tight cluster together under a rock arch). A couple of days ago, chromis took up residence under the BTA arch too. Now it is doing all of the "twerky dance" stuff that the clowns do and it's doing it right along with the clowns. Never the male clown, only the female. Female seems equally enamoured with her clown partner and the green chromis. No aggression between any of them. All of the little face and body bumps, all of the tail wagging. The whole nine yards. What the hell?