Baktopur is great against bacterial infections and I never noticed it harming my fish (gouramis and corydoras) even when I dosed 180% of the recommended dosage. It combines acriflavine with methylene blue. A fish vet also recommended to use 0.5 g of salt per liter in combination with this med for treating my gouramis. If possible, this med should only be used in a quarantine tank because it will probably kill the beneficial bacteria and it seems to work way better in unestablished tanks. It can also harm plants or stain equipment.
