Fin Rot


Fin rot is a common disease that describes the rotting or fraying of a fish’s fins or tail. If you suspect that your fish may be suffering from fin rot, take a close look at their fins and tail for the following symptoms:

Fins or tail appear to have frayed edges

The fin or tail edges have turned white, or even black and brown in some cases

Inflammation at the base of the fin

A part of the fin or tail may have rotted away or fallen off

These symptoms are often accompanied by a loss of appetite, less activity, and your fish sitting at the bottom of the tank.

Fin rot is most often caused by a dirty tank and poor water quality, poor care, or exposure to other fish who may have contagious diseases. Fin rot can also be caused by injuries such as mishandling of fish or nipping and bullying behaviours from other tank mates.

How to treat your fish for fin rot:

Syphon the gravel at the bottom of the aquarium to remove any waste and debris.

Do a 25% water change of your fish tank

Check and monitor your water conditions. Test for factors like pH, temperature, chlorine, ammonia, nitrite and nitrate levels. You can test for these with a home water testing kit or head into your nearest Petbarn with a 100ml sample of your tank water for a free water test.

Move the affected fish to a quarantine tank if not all fish show signs of fin rot with a separate net. This is important to prevent the fin rot from spreading to other fish. It is also a good idea to move the fish if it is being bullied by tank mates to prevent further nipping.

Treat the affected fish tank with Blue Planet’s Tri-Sulfa Tablets, API Stress Coat, Melafix or a vet prescribed antibiotic following the product label’s instructions.

Remove the active carbon from the filter during treatment.

Monitor your fish every day to check if the fin rot has stopped. If treatment is successful, you may notice that the damaged fins and tail will slowly grow back after a few weeks.

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