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Ive got something in one of my live rocks that I cant identify. It is white, long, and stringy. It only comes out when the lights are off. I was thinking it is just a tentacle from a spaghetti worm but Ive only seen one. If it is a tentacle Ive never seen what it is attached to. When I shine a flash light on it, it slowly retreats back into the rock. Im guessing it has a slime or film to it because it seems to be dragging bits of sand back with it.
What is it?
What is it?