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Poor guy. You got him here, didn't you? I had two of those gouramis, and both of them seemed totally healthy for a while, but then they each died suddenly, one about 4 months after the other. I remember wondering, after gourami #2 died, if the stock was bad, or if they had something genetic and progressive like tumors.
Is he still eating and swimming ok? Both of mine lost their appetites and grew noticeably lethargic about 36 hours before passing away.
Sounds like you're doing all you can!
Looks like some sort of tumor. I don't have much faith in Melafix or Pimafix as they are homeopathic herbal type remedies.
Try this site to identify.
It is pretty difficult to see exactly what it looks like, lympho, open sore, etc?
Would you like to try more crude method since nothing had worked?