Water Plants and the Nitrogen Cycle Why do my fish get sick and die? Your koi pond (or any recirculating water environment) is a closed system; water stays there. Fish constantly feed and emit waste products in the form of ammonia nitrogen, or NH4. This makes the water progressively unfit for fish health. The Nitrogen Cycle The biological event that cleans up the waste is called The Nitrogen Cycle. Beneficial bacteria in your pond constantly convert NH4 (ammonia, toxic) to […]
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