Actually, I've never seen problems with my peppermints and the banded coral shrimp. I got the last batch of peppermints about the same time as the blennie and when I put them in, the bandeds went after them a little bit, but as soon as the pepps learned to respect them, everything was fine. I've found the same for the fish I add...they usually get nipped a couple of times before they figure out to stay away too. That's another good thing about this new tank...more space for the bandeds.