The difference between fin rot and fungal infections in fish

13 January 2026
Betta Bite
The difference between fin rot and fungal infections in fish

Fin rot is a bacterial disease that manifests as fraying at the fin tips, giving them a "ragged" or "melting" appearance; it is often caused by poor water quality or stress in ornamental fish.


Fungal infections, on the other hand, appear as white patches or cotton-like filaments on the body or fins.


How do you identify the type of disease?


• Bacterial: Ulcers, redness around the fins, and impaired swimming.


• Fungal: White filaments on the skin or scales.


Products recommended by Betta Bite:


- Fin rot: Seachem KanaPlex – eSHa 2000 – API Melafix


- Fungal infections: Methylene Blue – API Pimafix – Seachem Paraguard


Tip: Before starting treatment, ensure water quality is improved by performing regular partial water changes and cleaning the filter to optimize tank conditions.

Not found