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Any Idea What This Might Be

Found this on a rock and I think it can move, I have not touch it yet cause I like to find out what it is.
Thanks in advance.
 

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I have them in my tank...I usually find the shells in my filter socks which I guess means they are growing like mad in my overflow. Just another good critter.
 
limpet +1. harmless part of clean up crew. Although when they die -those shells clutter the injection on my skimmer.
 
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