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Beautiful fish but they will let you know if you don't properly QT everything or if you have water quality issues. They probably aren't more problematic than many other similar Tangs, but they are more popular which makes hearing of problems more common.Man I want one these fish but the more I read the more I don't want one ! looks like so many issues with them..
That looks like a bacteria infection, poor guy.
You can find more info here.
https://www.reef2reef.com/threads/bacterial-infections.191511/#post-2196167
If you can, get them into a QT/HT and treat with Metroplex, Kanoplex and Furan-2. That is your best bet IMO.

