Fluconazole Is broadly a single treatment. You take off your skimmer cup (the skimmer goes crazy) and carbon (other stuff like GFO too according to some instructions) dose and wait. Don’t expect to see any change for a week, but after that the algae will start breaking off.
The thing is the half life is a day or two (depending on physical conditions) so after a week it’s virtually all gone and you can put your skimmer cup on to remove the algae, probably turn on any carbon filtration and too.
After 14 days you can re dose.
As said it’s a fungicide it works by weakening hair algae cell walls causing it to break up