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I believe it is an asterina star, generally harmless though I have seen them eat zoanthids. There are many different types of them just monitor.
Mike,How big is this starfish? Hard to tel from the pic.Kelly
Asterina StarfishI leave them alone. There are mixed opinions about them.
They can explode though. Once had hundreds, so I got a harlequin shrimp which eraticated them in about 6 months. Manual removal works too if the numbers are reasonable.
Mike,If you're going to try to remove them, let your glass get a little dirty and they will come. It's easier to see and catch them from the glass than on the rocks or sand.Kelly
I'd go with harlequin shrimp. I loved mine. You will have to feed it a chocolate chip star or another type of starfish once all those are gone if you want to keep it alive.
Unless they are harming corals, they are just another part of the CUC. I have had them in my tank since the beginning. They seem to come and go population wise, no doubt based on food availability. Right now I hardly ever see one.