There is an approach to ALL fish disease cases that people want to short circuit. They want to go from identification of a sick fish, to the potion that cures it. Sadly, almost all fish health cases are tied to water. So while people are trying to figure out what medicine they need, they’re losing fish instead of changing water, increasing aeration, bioseeding the tank and employing constant water replacement. No medicine at all.
So all cases start with assessment of crowding and ‘new fish’ syndrome, swing through water testing and THEN sometimes into treatments.