I showed one of these recently as an “I don’t know what this is, you guess.” My dive buddy told me it was a “fiddle” star but he just had trouble with the pronunciation since the book confirmed what he said, sort of…. They come in a variety. They have feet that attach to the coral. They come out at night and move pretty because you definitely don’t see them in the daytime. They spread out and look very delicate. There is one that looks like an unkempt weed but it is definitely animal.