One more question about hitchhikers, then I should be done
On one of my rocks a clam or mollusk (shaped like a FW clam) was attached. A standard grey/brown shell housed the guy and was about 2" long. Anyways, he moved several inches during the night. I then saw him about 3/4 in the sand, and now he's gone. I tried digging in the spot where I saw him last, and he's not there. Do you guys suppose he could pose any threats? I'm more worried about him dying and fouling up the tank.