Red stuff does appear to be sponge. White stringy stuff could be baby
featherduster worm tubes

"StringerBell" wrote in message
...
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