If you don't want to get rid of him...hmm, maybe put him in a QT tank if you have one or rearrange the rocks so that he loses authority and needs to reclaim his territory. Maybe putting him in a nesting box setup would have the same effect. This would cause stress, but it's the only thing else I can think of. Haha that's one strange "relationship" and I don't know what to say about that. Don't mind at all, I have a 70 gallon w/ a clown, chromis, cleaner shrimp purple firefish, McCosker's Flasher Wrasse, yasha goby & candy stripe pistol shrimp pair, and some corals. I just added 3 of the fish yesterday and all is well. I'm still planning to get a midas blenny, tomini tang, and maybe a basslet or two banggai cardinals, but I'm stocking slowly. Taking it slow and steady like everyone has been saying