Sounds like a variety of worms, but sounds most likely like a peanut worm. Theyre nocturnal and when they sense the slightest bit of light they run to their hole. Their sessile inverts so they wont me moving all over, theyll only feed on the areas they can reach. Theyre reef safe and pretty cool to watch for the first day or two that you have em...then they get boring lol. but no need to worry. Got any pics?
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