Something eating corals

Wasabiroot

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Re the heat; water has a high heat capacity. It's likely your tank temp fluctuated less than the air did - it takes a long time for water to match air temp without outside influence. That's why lakes remain cold even when it's warm out in the spring.
 

PR_nano

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Could be the peppermint or any crab.

I have a scarlet crab that nips coral and recently caught him breaking the spines of my pincushion urchin.
 
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