Big Clam

[VoodooChild]

One more question about hitchhikers, then I should be done:rolleyes: 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.

[Boogiechillin]

Shy of tearing your sandbed apart, odds are that you won't find it easily. Look for a siphon extention above the sandbed - most bivalves that bury themselves leave a tube extended above the surface to intake water for filter feeding. You can expect this critter to probably die off over time...they need more food than you can usually provide in an aquarium without wrecking your water quality.