Fin Rot: The Causes, Symptoms & Treatments

Fin rot is a common yet serious disease in aquarium fish, typically resulting from bacterial or fungal infections. This condition manifests as fraying, discolouration, or rotting of the fish’s fins, starting at the edges and, if untreated, progressing towards the base. Often, this disease is an indicator of poor water quality, stress, overcrowding, or injuries. While the disease itself is treatable with improved water conditions and appropriate medications, prevention, primarily through maintaining optimal water quality and minimizing stress, is the most effective strategy.

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Recognizing Fin Rot

How to Treat Fin Rot

  1. Remove any uneaten food or plant debris. These contribute to poor water quality and bacteria growth.
  2. Next, clean the walls of the tank using a suitable algae scraper or pad. Be careful not to scratch the glass.
  3. Use a siphon to vacuum the substrate. This removes waste that could lead to ammonia spikes.
  4. While cleaning, replace 20% to 50% of the water. Ensure the new water matches the old in temperature and pH.
  5. Be sure to clean or replace the filter media. However, maintain some old media to preserve beneficial bacteria.

Causes of Fin Rot

Preventing Fin Rot

Summary / Frequently Asked Questions – FAQ

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