Huma, I hate to say it but I think youre gonna have to actually qt the fish and medicate or hypo them. Theres not much else you can do with it in your tank that is a guaranteed cure.
It may go away for a while, but it would haunt me knowing that it's in there still. And if it comes back I hear it;s worse than the first time it hits cause they have multiplied in your tank.
Good luck, keep us updated. I was hoping for an easier fix for you since your fowlr
but it seems you can't catch a break.