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Koi fish can die from several factors, including poor water quality, such as high ammonia or nitrite levels, and low oxygen levels. They are also susceptible to diseases and parasites, which can weaken their immune systems. Additionally, stress from overcrowding, sudden temperature changes, or aggressive tank mates can lead to fatal outcomes. Finally, inadequate nutrition or contaminated food can also contribute to their decline in health.

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AnswerBot

2d ago

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