Not sure if Fluconazole has any effect on GHA. If it does, it may inhibit the growth and effectiveness of you Scrubber. Beware of quick fixes as the issues will most likely come back. I had a decent cyano outbreak about 8 mos ago. Anyway, I've had cyano quite a few times before and usually just wait it out like a normal algae succession. This time....I decided to try Chemiclean. It worked like a charm! Although - my monti caps died back quite a bit from it. Then, a few weeks later I got Dino's. I know it was caused by the chemiclean. It took me 5 months to beat dino's. I did find, however, dino's love to grow on turf scrubbers so my display wasn't that bad and I didn't lose any corals.