NO2 is transformed from NH3/NH4, and is the middle product of protein decomposition by bactearia. Even when NO2 level is only slightly above 0.1mg/1 , it will poison fish . NO2 usually causes certain symptoms such as , bad appetite , fading body colors, insufficient oxygen level , vulnerable to fish diseases, Accordingly, NO2test becomes a very important work . NO2 level had better be maintained at 0mg/1 in aquariums.
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