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Nitrite is an intermediate metabolite in the CYCLE. Nitrite binds fish Red Blood Cells causing gasping and brown blood disease. Fish that die with their gills widely flared died of Nitrite induced “met-hemoglobin-emia”

Ways to combat nitrite intoxication are as follows:

  • Know the problem exists, a simple test will tell
  • Partial waterchanges will lower Nitrite levels
  • Addition of salt (non iodized 1 teaspoon per gallon all at once) will inhibit uptake of Nitrites
  • In many instances, the filter needs cleaning or upgrading
  • Feeding should be suspended or reduced