Too funny, I was just about to ask for an ID on these too. About an hour ago I saw what looked like an oddly colored bristleworm poking out of my live rock. I moved in with the flashlight and a short pair of tweezers after lights out. I was intrigued as it wrapped around them...so intrigued that I didn't notice the other 3 arms poking out of 2 different holes in the live rock...at least not until one of them wrapped around my finger.
Yes...I freaked out. Glad they are scavengers and not mini people eaters.
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