Those are sponges.

Wayne Sallee
Wayne's Pets



StringerBell wrote on 10/15/2006 12:08 AM:
The pic is a close-up of a cave in my tank. Is the red stuff Sponge? Near
the center of the pic is some spongy looking white stuff---please let me
know what it is. What are the white strands that look like roots?
thanks again..............
http://www.angelfire.com/planet/skam...ave_zoom_1.jpg