I just received a serpent starfish, I was sent the wrong species. Anyway it is a non predatory species but I think my fish are unsure of it. Especially my Firefish. He abandoned his bolthole altogether and just hugs tightly against the rocks. Under ledges, mid tank, it hovers near his bolt hole hit he will not enter it. He only presses as near close to the rocks as possible. Is he afraid of it? Or just doesn't like the new inhabitant? I'd rather have my fish act like he did rather than have this starfish. Oh, one more thing the fish was seen this morning rubbing on one of the starfish's arms. Not like a scratching but fast and almost aggressively? He eats fine I just don't think he's happy outside his hole.