Nitrate is produced by the bacteria in the aquarium filter and gravel. It is considerably less toxic than Ammonia or Nitrite but is harmful none the less. In planted aquariums it can be removed by the plants to some extent but water changes will still need to be made. In non planted aqurariums the only way to remove it is to change the water. While many fish can tolerate up to 50ppm, keeping nitrate levels down to 20ppm will ensure the health of even the most fickle fish.


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16 06 2009
Green Water! « Cichlid Diary

[…] It happened the day after a 50% water change so the first thing I did was to check my tap water nitrate levels. I live in a rural area and it seemed possible to me that agricultural run off was turning […]

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