Help!! Brain coral damage!!

RockyroadReef

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Hi, I have this awesome piece if brain coral that I love, but noticed today that there is thus section of exposed skeleton on it. Does anyone know what could be the cause? It looks pretty healthy besides that.
Thank you!
P.S. enjoy the clownfish photo bomb
20210806_201723.jpg
 
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RockyroadReef

RockyroadReef

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Would fish suddenly do that? Because I've had this for a little while now and they haven't munched on this or any other corals in my tank, and I have mixed coral tank.
 

Beau_B

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If you don't have any suspicious fish, I would be looking at the CUC carefully. A rogue crab being the first in the line up.
 
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