i dont have my digital with me today its back at my dorm... but it looks like mold from the fridge when its all white and fuzzy. also i should mention that this isnt live rock... it was rock that was at my lfs and it was in the base rock bin but it looked very cool so i got 2 pieces. there looked to be some green mossy lookin stuff on it but it was very dry so i know it was dead. could this just be the dieoff from the moss/algae?