Ack the black would be a sign of necrosis. :/ That's strange, doesn't look like it should be happening at all. He's definitely gotten past the point of primary infection, or at least should be. Been 9 days after all since the bites.
Don't really know what else you can do besides that which you have done tho, have to wait for others who know more for a better answer.
Can fish suffer from necrosis? For some reason I though that was skin cells only? Although I guess from what I just read that it can effect plants?
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