I cannot keep skunk cleaners in either of my tanks, they get eaten (the one in my avatar was killed by a neon dottyback shortly after it molted). Fire (blood) shrimp have fared better, since they tend to hide in the rocks. In my 55, a large peppermint shrimp routinely cleans one of the Anthias. The first time I saw it, I thought the fish was dead and the peppermint was eating it. The fish was belly up and the shrimp was holding it. Weird.