I bought a cleaner shrimp (scarlet skunk) a week and a half ago and put it in with the Ray as to take care of any Parasites on him and was taking care of buissness cleaning the Ray. My wife and I went to St. Louis last fri. and sat. and when we came home I looked into the pond and saw that the Rays tail by its stinger was red so i thought the Sailfin Tang was picking on it but never saw it happening. Today when I came down to check things out I saw the cleaner shrimp pulling at the Rays tail while it was under the sand, when I said pulling I couldnt believe that that little 2 1/2" shrimp could pull that hard. Now its kind of tore up but not real deep so hopefully he will heal. Any ideas why a shrimp would do that?