What is this in my GSP

marcmen

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Hi all, can anyone help me identify this white mass in my GSP? I noticed two of the masses have holes in them.

IMG_0535.jpg IMG_0536.jpg
 

Fredda

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I dunno what it is but think i have the same under one of my Blastos. Thinking is some fungus? Also have similar under a montipora, but that is yellow (on pic)
 

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marcmen

marcmen

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Gotta love this hobby - I don't think I did as much research as I did when I was in school.
 

shakacuz

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sponge. harmless filter feeder. not sure of the exact name of that kind, though
 

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