LionFish says.......
Well, I hate to burst some people's bubbles here but you can bet that a scarlet cleaner will rip up corals that feed. Now, I say this only as a precaution to keep them well fed. They are very good reef inhabitants, however, but if they are not properly fed they will tear open a few corals to get food. I have seen this done with my scarlet cleaner. I don't usually feed him but I do regularly feed my yellow polyps. I noticed that a couple had been torn open and the belly of the coral had been torn and food had been ripped out. I soon discovered the shrimp was the culprit. Not all shrimp will do this but you have to keep them fed. It was my fault in the first place that it happened. It is not common so no worries but don't don't think it can't happen. I have so far kept him fed with a pice of frozen shrimp every 3 to 5 days and he hasn't touched the polyps since. Just a warning. But other shrimp are exceptions. Stay away from Peppermint shrimp. After they're done with aptasia they moved on to my polyps and then decided to tear apart me $75 bubble coral. Needless to say, they met my lionfish.