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Looks bacterial, use Furan-2 to medicate the aquarium. Dwarf Gouramis are very sensitive fish, I've had 3 in my aquariums in the past and none of them made it any longer than a week so I started avoiding them.
Yes thx I went and got this liquid that I have to put in the tank for a week. But unlike u I've had good luck with my DG I've had him for about a year now and until now he got sick