a little more detail would help like what color it is.. It could be a bristle worm or even brittle star if the mistakes each tentacle for individual worms. if it is a worm indeed, then i think it could be a bristleworm.. there are many kinds of bristleworms. only 2 types are known to be harmful(i think) to corals.. the bristle worms will eat left over food. If it is a fire bristle worm dont take it out by hand because it can sting you and this can be irritating for a few days. just try to take out the rock or use a trap like a pop bottle to lure the worm out..
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Richie
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