100% ich/Cryptocaryon (I rarely say that!). It is fairly advanced so you are going to want to get a treatment started soon.
Hyposalinity is one option, copper works as well. I’m not a fan of TTM, the extra handling and ammonia build up is extra stressful to the fish. Here is my write up on hyposalinity in case you want to try that:
Hyposalinity Jay Hemdal 2024 This term refers to a long-term bath treatment for marine fishes in which the salt content of the water is lowered and held below the point that certain parasites can survive. The salt level reached, and the time of the treatment are the two variables...
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Jay