It sounds like you’re likely just going through normal tank maturation (especially if you started with dry rock). Do you have some pictures so we can see what exactly you’re talking about.
One important thing to remember with fluconazole, is that it can up to 2-3 months to completely kill some algae (GHA being one of the types that takes longer).
Its your tank and your life, but IMO, it would be a shame to give up on a fairly young tank because of some algae, especially if it’s not really affected your corals.