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    Denison barbs suddenly died

    They had been in that tank for over five years with consistent water parameters
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    Denison barbs suddenly died

    I just pulled up the API test kit key and see my water tested between 40 & 80 ppm nitrates. I will continue working on bringing that down. I'm stumped. I don't see why O2 levels would have changed and the temperature is consistent. Obviously something didn't agree with the barbs overnight though
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    Denison barbs suddenly died

    I tested the water when I found the dead fish. I'll post the parameters when I get home tonight. Thank you for the information on nitrates
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    Denison barbs suddenly died

    Thank you so much for your response! I don't have the exact nitrate ppm with me, I'm at work. It has been steady for years though. The tank, with the barbs, was established mid 2018. I've been told that a consistent level is ok. I only did the 50% change once they were all dead already...
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    Denison barbs suddenly died

    Three of my four denison barbs suddenly died overnight and the fourth is dying. They were in a 75 gallon with a seven, goldfish, and for bristlenose. The tank was healthy and steady for five years. I recently separated one barb and treated him for what looked like a fungus on his tail. He...
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