Ingredient risk record
Fluconazole
Also appears as: flucanozole
An antifungal used against stubborn nuisance algae, notably bryopsis. Fritz describes Expel-F as broadly compatible and explicitly safe alongside Coppersafe, Maracyn and Maracyn Two — but warns it affects desirable macroalgae and can make some corals retract temporarily, which matters in a reef display rather than a fish-only tank.
Source-linked caution for
The evidence is formulation associated. It raises a warning on a product containing this ingredient but never decides the verdict.
“Expel-F will affect desirable macroalgaes and may cause some corals to retract temporarily.”
manufacturer page · fritzaquatics.com · checked August 16, 2026
The inference only runs one way
A product containing fluconazole gets a warning. But a product without it gets nothing — no clearance, no green tick. Fritz Algae Clean Out contains no copper and is still explicitly unsafe for shrimp and snails, which is why FishyMag will not certify a product as compatible unless the manufacturer says so directly.
Treatments containing fluconazole
Next steps
FishyMag reports what manufacturers say, quoted and linked. It does not diagnose illness or recommend a treatment, and it never infers that a product is safe from the absence of a warning — where no statement exists, it says so.
Formulations change. Always read the label on the bottle in your hand, and contact the manufacturer if your tank contains anything valuable or unusual.