Noticed these black spots on our sailfin tang a few days ago & went with the assumption it is black ich. The spots like this are on both sides of this fish. It is eating normally ie nori, mysis shrimp, shrimp flakes. Started treating with prazipro two days ago. Do you think this is black ich? Saw in another post that regular ich could present like black ich visually? Any input on this would be appreciated. Thanks!