I need some help from you Fishperts....I have a Gourami that has a illness/sore that I cant get to go away and was wondering if anyone here could help me out. This Gourami has had this spot for about 3 months...it is slowly getting bigger. Everything I have tried has failed, so far no medications have improved this fish at all. No other Gourami or other fish has this.

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Any help would be appreciated.