Clams move?

[Myka]

My Squamosa is always moving around and annoying me! Everyday I turn it towards the front so you can see it, and everyday it turns itself away. I will win eventually...or so I keep telling myself! It was attached to a frag disk, but I peeled it off since it was crowding a frag. I put a new frag disk under it, but the clam doesn't like the new frag disk. When it was on the disk it didn't move everyday like it does now.

My Maxima on the other hand hasn't moved from where I put it in the sand. I have been considering moving it onto the rocks, but I'm not sure if it has attached itself to the bottom of the tank or not. If it has, I will just leave it alone.