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Also, I’m not completely sure any fish showed signs of ammonia poisoning besides the black fish, can fish still die from ammonia without clear, blatant signs?

Thank you very much for your helpful response, here’s what my mom has to add. She hasn’t been checking ammonia as much as nitrite, so we will focus on that. Everybody was fine for 2 months until the new koi came in, got sick, left, and then two other kois died. The death was super sudden, as...

Hello, this is my first post here. My mom has a cold water tank that used to have 3 fancy goldfish, 1 comet goldfish and 3 koi fish. She added in a black koi less than a week or so. The black koi turned gray and had red gills so my mom returned him, 2 days later both kois died. After she changed...