My tangs used to hang out with my cleaner shimp all the time. I was great to watch. However, I am not sure who, but somone in the tank, kept eating the neighbor.. and no more shrimp. I tried a few more times and no luck. I was basically buying an expensive snack for someone in the tank. Since then, I have gone with UV and water flows that are slow enough the kill most anything. I still have some cleaner "things" but I use UV over the shrimp now.