This is a discussion on What do you think could it be? within the Coral and Reef Creatures forums, part of the Advanced Saltwater Discussion category; -->
Couple weeks ago this stuff appears in my reef, but i have no idea what is it.
Coul anybody tell me what is it?
I would be interested in the answer to this. I have the same thing growing deep inside a crevice in my live rock. It is still to small and deep in the rock for me to post a quality picture, but it is definitely growing.