I have a royal gramma in a tank with a cleaner shrimp. The shrimp waves his feelers at the shrimp and moves in towards the gramma, but the gramma quickly swims off the other way. I had a clown who didn't like to be cleaned by the shrimp, but it just ignored the shrimp instead of running away.
I thought all fish welcomed the services of a cleaner shrimp, if not just ignoring it. Is my gramma unnaturally shy?