illness from crap water, has nothing to do with fluconazole.the top of tank and has white spots on it
I have had a clown pair for 30 years and not once has fluconazole made them sick.
Your dose not that high, I have been dosing by tank size for decades.
You need 100% water change and your fish will thank you. Once fish are happy go back to using fluconazole, and follow that with large water changes, takes a few weeks and a few doses, to correct your problem. Then I would use something like vibrant to keep tank clean.