I have 3-4 of these guys. I had sand sifting starfish once that my saddleback did not like him much. He was carried around by the saddleback and died one day. These look a like that starfish.
Asterina starfish. Common hitchhikers, most are reef safe however there really isn't a way to find out the exact species. All of them safe or not can over populate aquariums. Should that happen harlequin shrimp will clear them out but they won't mix well with your fish..
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