I have a blue spotted stingray and cleaner shrimp together, and they have been doing great. The stingray always allows the cleaner shrimp to clean it. I also had the same cleaner shrimp with a yellow head moray eel and the moray would leave it's mouth open so the cleaner shrimp could clean it. This same moray eel killed about 10 of smaller fish, so it was strange it never ate my shrimp. This my experience though, and other people may have completely different experience with both.