I have a regular old skunk cleaner..He does a great job of grooming all my fish, except the Dragon Wrasse, I've never seen the wrasse go near the shrimp. On the other hand my Niger Trigger just loves to be picked clean. I was worried that he would munch on the shrimp, it took 3 months for the shrimp to get up the nerve to pick at him. It kind of reminds me of the little birds that clean the teeth of those crocidiles, inside the crocs mouth. I'm going to get another cleaner pretty soon. They are great to watch.
..rick