Hammer coral dark area

Hogdaddy

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Noticed my hammer coral has a dark spot. Friday it looked full/health in the front right...today, not so much...looks like a few hammers are retracted and dark. Is that normal, or a sign of a bigger problem?
Tested water friday with red sea-
Ph- 8.2
No2, No3, Nh3 all zero
Alk 9.0

Spot fed some mysis friday morning.
29BDFB2B-AA12-43D5-BA43-30F5FAB2E08C.jpeg
 

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