Looks like its exhibiting some sort of photo tropism so I would lean away from it being a sponge. What ever it is it looks pretty cool, my guess is some sort of calcareous algae. Anything in your tank go after it as a meal?
Levi
(Only thing is its black, and you don't see to many things that use photosynthesis that exhibit an overall black pigment.)
Last edited by Zoaelite; 11-29-2009 at 07:36 PM.
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