Does anyone know what this is?

kalymnos1971

New member
This was on some live rock I acquired a week ago. Thanks
 

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I can't enlarge your photo, but from the thumbnail it looks like either a sponge or, more likely, green star polyps with their polyps hiding.
 
The picture is inaccurate showing a purple tint. It is primarily white. Is that because it is trying to make a comeback? This rock is new to my aquarium.
 
Can't really tell much from the photos - all you can see is some sort of encrusting - could be anything. Can you take a photo with polyps extended.

If the polyps are white - I have something similar. Still have not ID'ed it.

uknowncoral by n, on Flickr
 
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