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Why did my fish get fin rot?

Warren Peace

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Hi! I'm new here. I have a question.  And one of my neon tetras in a school of 7 in a 10 gallon tank with 1 nerite snail has some fin rot. I don't know why. I immediately tested my water, and it came out 0ppm ammonia, 0ppm nitrite, ~30 ppm nitrate. I do 25% water changes each week, and I have cryptocorynes, and some vallisneria. I had this tank setup for about two years. Anyone have some ideas?



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What your Ph and other water parameters including temperature? Typically stress is what causes a disease outbreak.

My ph is around 7, I run my heater at 78 degrees. Around 9 degrees GH, and 8 dKH. Sometimes, one of the neons chase some of the smaller ones. Could that be it?

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