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					Originally Posted by Tarolisol  im pretty sure its a keyhole limpet. sometimes it will have a white patch on its back. They are harmless. | 
	
 If so, thanks for both the question and the answer - Because I have 2 of those hickhike with the rock when I bought some corals last month. I was really small and now almost about 1/2 inches. Still in there 
