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					Originally Posted by  nanomano
					 
				 
				EDIT. He apparently looks like a small "stubby" centipede and is grey according to the Mrs.    
			
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 From this description sounds like a bristle worm to me. Shouldn't me worried about them. Try taking a flashlight and night and see if you can see them as their always out at night. They can get quite large over time but they are great for eating extra food and such.