cottonball like growth

[atlfish]

Hi guys:
 
I have this white cottonball looking grow on my live rock. Can anybody tell me what that is, and is it safe to have in my tank?

 

[meowzer]

sponge.....harmless

 

[atlfish]

Thanks! I thought it was some sort of egg sack at first.

 

[joelle]

i have the samething on mine and just asked my LFS...