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Nitrates at a low level, say 20 to 25 parts per million (ppm) are fine. This form of nitrogen is the end result of the "nitrogen cycle", so a low level won't harm fish and are used by aquatic plants for food.
You never want ammonia or nitrites over .25ppm and it's best to keep nitrates at 20ppm or lower. Do some research on the Nitrogen cycle. You'll learn by doing reseach.
You never want ammonia or nitrites over .25ppm and it's best to keep nitrates at 20ppm or lower. Do some research on the Nitrogen cycle. You'll learn by doing reseach.
When I say 1ppm ammonia harm, I mean your fish will have permanent damaged gills or may die. Ammonia can be +- harmfull depending on temperature and PH, as it can be on the form of ammonium.