Hitchhiker in new tank

[inawe]

While carefully studying my rock I discovered something living in it. I can't tell what it is, but from the end I see it looks like one of those worm things from that old Kevin Bacon movie (Tremors?), but it could be some sort of clam...maybe? It kinda opens a little, then closes when I shine a little flashlight at it. My question is...can it survive the cycling of the tank being on the outside of the rock?
cc in tx

 

[renogaw]

you'd be surprised what can survive cycling the tank. just hope its a beneficial hitchiker if you cannot get a picture of it.
if you can get it out, try to, but if you can't there's not much you can do.