I’ve had peppermints in my old display for a years, they keep the small ones in check but every now and then a couple large ones pop up and linger.I’ve had tremendous success with peppermint shrimp if you want to try an easier route.
There was no bullying, that one just would not eat with the group. Every time a clam hit the water the blenny, cardinals, clowns, tangs, and even Helfrichi would swarm it and the CBB would just swim away. In the acclimation box it ate like a champ for 4 weeks but once in the tank It was impossible to try and feed it aloneYou have to figure out what fish it’s bullying him and put it in a acclimation box… that’s what makes him stop eating