AK Fresh Water - could you post another picture, please? Regardless of his current condition, I think another picture would be helpful. It might allow people to identify if this is the 'mystery disease' (Mycobacteria sp
.), based on the progression of symptoms, or something else.
(There is no way to truly identify if this is Mycobacteria
without a lab analysis.... But I had a Betta die recently. I'd posted pictures as his disease progressed, and someone asked me to post a picture after he had died. On the basis of the photos, two people here felt that he'd had this 'mystery disease.'... So, if you don't mind posting pictures, they may be of aid to the knowledgeable people here. That said, it can feel kind of creepy to post photos if he's getting sicker (or has passed away), so I can definitely understand if you don't feel comfortable doing it.)