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I have a 20,000-liter koi pond that's been home to around 35 koi for about 20 years. Recently, my fish stopped eating, started splashing at the surface, and stayed at the bottom of the pond. Sadly, they began dying one by one, and I lost about 15 fish. The symptoms pointed to parasitic infestations and secondary bacterial infections.
Feeling overwhelmed and unsure, I turned to the internet for guidance, especially relying on Google Gemini. Empowered by the information I found, I decided to try potassium permanganate crystals, which are inexpensive and readily available online.
Day 1: I applied 2 mg/liter of potassium permanganate (40 grams total) to my pond. The water turned pink initially, but within a few hours, it became a murky brown, and I couldn't see anything, even an inch below the surface. There was no sign of life, and I was worried. I continued researching online and waited anxiously. After 48 long hours, the water started to clear slightly, and finally, I saw signs of life! I did not add any hydrogen peroxide.
Day 4: The water continued to clear, and I was relieved to see more than 15 fish swimming actively and eating eagerly for the first time in two months. There is still some cloudiness, but I'm optimistic and plan to repeat the potassium permanganate treatment at the same dose on days 4 and 7, if necessary.
Conclusion: Potassium permanganate appears to be a lifesaver for large koi ponds, especially considering its safety and affordability. I hope sharing my experience helps other koi enthusiasts facing similar challenges.
Note: Always research and follow proper safety guidelines when using any chemicals in your pond.
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