Please help....Unidentified "Thing"

sharper

New member
I don't know if this is a clam or what, so I might not be posting this in the right spot. But my 12g Nano is about 2 months old now and I've noticed this on one of my live rocks.
It closes up at night and opens after the light has been on for a while. The picture doesn't show it, but it has translucent feathers around the opening of it.
Here are a couple of pics. It is about the size of a pinky fingernail. Does anyone have any ideas?
150846.jpg

151108.jpg
 
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It's a clam.I have a few of these-they must have come in with some live rock.Mine have grown quite a bit.One of them is a 1 1/2".
 
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