Hole in hammer coral

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graeve11

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Sorry this is the best picture I can get. I’ve had this for awhile great growth. I dip all my new corals and now this hole has popped up. Any ideas?

26E848C3-1C7B-4DBD-BF76-1FC3A934CFCC.jpeg
 
Have you tested calcium? I think I've heard @vetteguy53081 mention it could be a cause.
 
Assure your alk and calcium are within range

Alk - 8-11
CA 440-460
ph 8.1-8.3
 

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