I just got a yellow figi leather coral from liveaquaria and it had a hitch hiker that seemed to be a sea star. It was about 3/4 of an inches wide, yellow/green in color (almost blended in with the yellow figi) had five skinny legs that almost seemed "spikey" so to speak. I ran for my camera to get a picture but when I came back it was gone. At this point I don't know if it is hidden in the tank somewhere or lunch for the clown fish or someone else. Any ideas on what it may be from what little I have? Any possible harm to the corals in my tank if it survives and gets bigger? Thanks!!