Okay so I ignored these things at first and now there are about a dozen of them and I am beginning to see dead, white spots on my pink coralline algae. They are very small and look like below except they have a bluish spot in them. I did read they will eat coralline. One particular turbo was completely covered with pink coralline and now he's half covered with dead white spots and I noticed two of these pest starfish on his shell. I've heard some people say these things are nothing to worry about. Has anyone else had trouble with these? If so, did you just pick them out one at a time?