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stech

Nitrate levels

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At what nitrate level is harmful to fish? My nitrate is 5 ppm but my ammonia and nitrate is zero.

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I typically try and keep it 20 or lower. :)

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Five ppm is fine for even individual fish that have high sensitivity to nitrate.  Common goldfish can adapt to very high levels of nitrate, but fancies may develop problems at concentrations below 40 ppm, with buoyancy problems one of the first to occur.

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