Hitchhiker/clam? - what is it?
 

Hi,

I recently purchased some mushroom corals which was attached to some live rock. Well, I noticed that a part of the live rock is shaped like a clam or something of that nature. Today i noticed it was slightly opened, while yesterday it was closed. I attached a picture of it, hoping that someone can identify what it is.


Thanks in advance.

Bi-valve clam, good filter feeder.

Thanks,

Does it require special lighting? or anything?

Nope, it'll get by on it's own. It feeds off particulates in the water column.