What's wrong with Kole tang

[hkgar]

Swimming fine, eating and no behavior changes. Possibly just abrasions from the rocks?
https://photos.app.goo.gl/pJBVHJmdTwCVZWHO2

[Bent]

Looks like some kind of bacterial infection possibly even mycobacterium.

How long have you had this fish?
What was his QT proceedure
Where did it come from?
When did the spot appear?

[hkgar]

Looks like some kind of bacterial infection possibly even mycobacterium.



How long have you had this fish? Two or more years
What was his QT proceedure TTM with PraziPro and 2 weeks QT
Where did it come from? LA
When did the spot appear? 1st saw it today - one on each side.

No new fish introduce in the last year. All fish TTM and QT

[Bent]

How long have you had this fish? Two or more years
What was his QT proceedure TTM with PraziPro and 2 weeks QT
Where did it come from? LA
When did the spot appear? 1st saw it today - one on each side.

No new fish introduce in the last year. All fish TTM and QT

I say it’s bacterial and it really looks like mycobacterium to me.

Since it’s a established fish it’s probably some sort of gram positive bug and the fish can likely kick it on his own. I’d let it ride for a few days and see if it improves.