Fighting?
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Can you pull him out and place in a qt? This may warrant metro, furan 2, and kanaplex. How long have you had him?
If you are unable to pull him out of the tank, you can try binding kanaplex with focus to his food.
It definitely looks bacterial. My guess would be it's a gram positive infection because he has a few scrapes that may have become infected. If it is gram positive, he should be able to fight it off. It never hurts to vitamin soak his food in the mean time and have the correct meds on hand.
When did you first notice this and how long did it take to get to this point?
Fish looks a little skinny, might just be being pick on , New fish, or New tank mates?
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Sorry to hear as well. It's so hard to differentiate between gram negative and positive. This was more than likely negative to kill that fast.