Fantail goldfish can develop fin rot when their immune system is under pressure from an injury, poor water conditions, stress from a new environment or antisocial tank mates. Aeromonas and pseudomonas bacteria occur naturally in most fish tanks and cause no problems when dormant, but they can trigger fin rot in a fish with lowered immunity. If your fantail shows symptoms of fin rot, partially change the tank water to rapidly improve water quality, then treat the water with commercial fin-rot medication.
- Skill level:
Things you need
- Water dechlorinator
- Commercial fin-rot treatment solution
Diagnose your fantail's condition accurately before starting treatment. Fin-rot symptoms include fraying and white-edged splits along the fins. There may also be bloody streaks in the soft tissue at the base of the fantail's fins. Fighting-related injuries and lesions can develop into fin rot if your fish tank water is unhealthy from lack of proper maintenance.
Remove about half the fish tank's water. Prepare fresh water in a bucket and include a dose of dechlorinator to neutralise chlorine and chloramine deposits from tap water. Many commercial dechlorinators also contain an anti-stress ingredient and a solution to enhance your fish's natural slime-coat layer to help protect against disease.
Read the manufacturer's guidelines on the fin-rot solution and add the required amount of medication to the new water. Pour the treated water into your fish tank.
Complete the course of fin-rot medication following the dosage instructions on the bottle. Change 30 to 50 per cent of your tank water approximately twice a week until your fantail shows signs of improvement.
Tips and warnings
- Dirty water encourages fin rot in vulnerable fish. Changing half of the tank's water every three or four days for a couple of weeks should cure the problem and prevent a recurrence.
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