Symptoms:
Fish may have deteriorating fins, often with red or white edges. Secondary Fungal infections often occur.frayed fins and tail, occasionally only a stub of the tail remains.

Cause:
Bacterial infection caused by Aeromonas and/or Pseudomonas bacteria often precipitated by poor water quality, low water temperatures, or a combination of both.
Treatment:
Careful monitoring of water quality and an occasional slight rise of the water temperature helps prevent this disease.The success rate for treating Fin Rot is good providing the illness is caught early and water conditions are kept optimal. Left untreated this infection can be deadly. Early treatment is essential! Once treated, fin tissue lost to this illness will grow back providing the fin rays and/or fin bases have not been damaged.
Prevention

1. Good water quality.
2. Regularly scheduled aquarium maintenance/cleaning.
3. Fresh food in small quantities.