With gouramis' mouths, it's most commonly a fungus. I would recommend getting a medicine specifically for fungi. Do not get the fizzy tablets for the water because they tend to not work as well as a liquid will.
With gouramis' mouths, it's most commonly a fungus. I would recommend getting a medicine specifically for fungi. Do not get the fizzy tablets for the water because they tend to not work as well as a liquid will.