Currently I have 2 clowns and a tailspot blenny in my 15. I have a pretty robust filtration system and the fish arent maxxing out my bioload capacity. Im thinking of adding a royal gramma to the mix. I have plenty of live rock that Ive made caves and hidey holes with. Would a gramma do well in this setup? Ive seen mixed things , but think that getting a healthy larger gramma would be ideal in preventing aggression. I saw a clown nipping at a RG in my LFS but this RG was small and runty and didnt seeem like it could fend for itself.