Treatment Protocol for Hemorrhagic Septicemia (Red Pest)
Aggressive antibiotic treatment required. Kanaplex + Furan-2 combination is most effective. Isolate in hospital tank. 50% daily water changes. This is a serious systemic infection — early treatment is critical. Often associated with spring viremia in pond fish.
How to Identify This Condition
Look for these symptoms in your fish:
- Red/bloody streaks on body and fins
- Bleeding under scales
- Swollen abdomen
- Bulging eyes (in severe cases)
- Ulcers and open sores
Early detection is critical — the sooner you begin treatment, the better the prognosis. Observe your fish daily during routine feeding for any behavioral or physical changes.
Root Causes
Understanding what caused the problem helps you prevent recurrence:
- Aeromonas or Vibrio bacteria
- Severe water quality degradation
- Extreme stress
- Immune suppression
Recommended Medications
The following medications are effective against Hemorrhagic Septicemia (Red Pest):
- Kanaplex — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Furan-2 — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Maracyn Two — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
- Oxytetracycline — follow manufacturer dosing instructions. Treat in a hospital/quarantine tank when possible to avoid disrupting your main tank's biological filtration.
Always have these medications on hand before you need them. See our quarantine tank guide for proper treatment setup.
Water Quality During Treatment
Maintain pristine water conditions during treatment. Perform 25% daily water changes using Seachem Prime as your water conditioner. Remove activated carbon from your filter during medication (carbon absorbs medications). Increase aeration with an air stone — sick fish need extra oxygen. Monitor ammonia and nitrite daily with your test kit.
Recovery & Quarantine
This is a critical-severity condition. Prognosis depends heavily on how quickly treatment begins. Isolate affected fish immediately in a hospital tank. Continue treatment for the full 21-day protocol even if symptoms improve — stopping early risks relapse. Monitor the main tank for additional cases.
Prevention
The best treatment is prevention. Follow these practices to reduce the risk:
- Maintain excellent water quality
- Don't overstress fish with aggressive tank mates
- Quarantine new fish
- Regular water testing
For a complete prevention strategy, read our quarantine tank guide and maintenance schedule.