I would try to get the Alk steady but keep it at around 7dKH. If you are using pellets or carbon dosing combined with a high alk it can lead to coral tissue recession.
Is your tank open top as wrasses like to carpet surf? They usually land in the hardest spot to find them behind the tank... Murphy's law.
If you had a temperature spike combined with a new fish addition I would watch the other fish for signs of Ick or Velvet.
Cheers,
Tim
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