This is a birds nest coral which started a little smaller as a frag, the white stuff has taken over the skeleton of the bottom of the birds nest (what was previously birds nest but is now skeleton because it was overshadowed, if you know birds nest you get it). So these used to be skinny legs last month but are now white dense forest and I’m afraid it’s hurting the coral and possibly invasive. This stuff is invading the rest of the rock and frags on it. It isn’t spreading like a matted algae but like it’s traveling to different places and proliferating. I don’t know it’s origin.
SOLVED: pineapple sponge colony
SOLVED: pineapple sponge colony
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