Treating a Koi Ulcer with Fuba Fix: Dosing and Biofilter Protection

An 800-gallon pond with Savio filter has a 7" comet with a dime-sized ulcer. Owner has Fuba Fix but label lacks frequency; worries about biofilter damage.

Dosing Protocol

• Use label dose for 800 gal.
• Dose every 4 days for 2 weeks (3 doses).
• After 2 weeks: 30% water change, then one more dose.
• Wait 2 weeks before any repeat course.

Biofilter Considerations

Fuba Fix (nitrofurazone-based) can inhibit nitrifying bacteria. Mitigate by:

• Maximize aeration during treatment.
• Add bottled bacteria after each dose.
• Monitor ammonia/nitrite daily.
• If spike occurs, do immediate water change.

Alternative

Topical wound sealant (e.g., propolis, Oradexon) on the ulcer avoids water-column medication entirely. Consider if ulcer worsens.