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Help with an ID

csecord

New member
Joined
Feb 22, 2021
Messages
7
This little guy was on some live rock that we got with our tank. Tiny at first, and whiteish, but he now looks much happier and has a greenish color. Rob, or anyone else, what is this? It looks and behaves like a mushroom by day, then the sun goes down and this happens —
 

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