Little Critters

[JON]

I set up my tank a week ago. What are the little white critters that occasionally come out of the pores in the rock. Also, I have a thing on the rock that opens up like a clam and closes when I open the hood. It looks like the rock though. Thanks!

[Kara]

I just posted asking about critters like this. OrionGirl posted a bunch of good links to help identify mystery critters on the post.

http://www.aquariacentral.com/forums/showthread.php?s=&threadid=6871

check out the links on that thread, they might help!