Just to add, not sure if this has any relevance but might be worth noting. The guy who runs my LFS who is also a renowned Discus breeder before he opened his own shop said the only meds he recommended for fungus, finrot, white spot and most bacterial infections was the Interpet ones.
Also adding a vote for Interpet treatments Learned that their products are effective the hard way unfortunately following a few outbreaks over recent years. Particularly fungus and fin rot, white spot and disease away treatments. I won’t bad mouth other brands but it’s up to everyone to come to their own conclusions.