Hello, last week I purchased a blue tang and at the time of purchase, there was nothing wrong with it. Today, I noticed that it appears to have white spots on its body. However, I'm not entirely certain. When viewed from a specific angle, it seems like there are spots, but from another angle, it appears as if there's nothing there. I am uploading some pictures and videos for reference. Could you please let me know if this is ich or something else? I have a quarantine tank, but there are other fish in the display tank. Is there a way to eliminate ich, or whatever it may be, from the display tank? By the way, there are corals in the display tank. There needs to be a treatment that does not harm them.Thanks all...