No, it was not atttached to a rock, but there appears to be some rubble attached to the foot area. I am going to keep in on my sandbed for a little while, before moving it to my rocks while it adjusts to my lighting. The only thing that worries me, which I somehow didn't notice when I bought it, is that it is very slightly bleached in the center of the mantle. You can kind of see it in the picture. Should I be worried about this? P.S. The color on the picture turned out really bad, the clam is more of a purple color.