Ok get some terbinafine hydrochloride cream (Lamisil), mix 1 ml of it to 200 ml of distilled water. Let the solution sit over night because the cream is slow to dissolve. Soak him in it for 10 minutes daily for the next ten days. See if this helps.

My tiger salamander was acting lethargic and sloughing skin off in a weird kind of way. I thought it might be a fungal infections so I treated him with this solution. After a few days, he was more active, the skins shed off, and he began to look normal. I don't know what it was, but this treatment did the trick. He now leaps for his food again.