found something I can't identify

Marinne13

Reef enthusiast
Location
Great Falls, MT
so it's to the left of the picture in that hole...has an oval shape with what looks like feathers around it. I have noticed it comes out sometimes and when I try and take a look it pulls back in the rock...WTH is this thing
 

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Im sure it has a fancy name, but that is what i know it as. Mine is right under the light, 4 inches under the water. It has been there for a year now
 
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