In article . com,
wrote:
You need to provide a nice range of nutrients for plants in order for
them to grow well, not too low= algae, not too high= dead fish from
very high NO3(100ppm or more using KNO3)

Crytps will curl the leaf ends with 3 weeks of 200 ppm but I never
say a fish, shrimp or snail be even uncomfortable let alone dead.

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