Please I.d.

[zachattak216]

I saw this in my aquarium last month and could not identify it on any hitchhiker guides. When I tried to pick it up to get it out it was attached to the rock. When I finally pulled it off it slipped through my fingers and into the rock. I didn't see it again till this morning in between all the rocks where I can't reach it. Can someone id and is this dangerous to my tank?

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[fragmatic]

Looks like a muscle from what I can see, was it hard? If it is it is a friend, filter feeder.


OH, and BTW...