identify please...pictures

[Octoberfest]

O.k., so again this tank is amazing me day after day. Last night I had moved some rock in my tank, and after everything was said and done I sat down and started looking at everything. I saw something and looked closer and have no idea what it is. The white part closes up and the brown part disappears inside the white part. If I had to guess I would say it's a clam of some sort, but I figured I'd ask the experts. I have another one of these in a different piece of rock but I can only see part of it and I can't get a picture of it.

Thanks for looking.

 

[sbgreen]

I have 2 as well, but could never snap a good picture to post. They close up to light

wondering what they are too.

 

[skylab1]

it's a rock clam, I have a lot of it all over my rock

 

[Octoberfest]

good? bad? get rid of it? shut my lips and be happy?

 

[sbgreen]

mine seems fine, them since June, no prob that I know of

 

[skylab1]

Yes, be happy.