I feel like I have the worst luck when it comes to fangs. I purchased a Naso Tang about 2 weeks ago. Yesterday I came home and he was very stressed. I examined him and noticed that he had a patch on his stomach and fin (pictures attached). I did a water change and dosed the water with prazipro. I did some research and didn’t see anything that matched the pictures. I watched him and he turned back to his normal colors and was active again. However I came home today and found him stressed again with dark colors. Any advice or anyone know what it could be?



