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Salifert - Nitrite Test Kit tunze Red Sea delivers high qualitySalifert Nitrite Profi Test In a properly cycled aquarium, nitrite is converted to nitrate and then, if there are areas deprived of oxygen such as in live rock and other filter materials, this nitrate is converted back to nitrite and then transformed into harmless nitrogen gas. If this cycle breaks down then nitrites, which are extremely toxic to fish and invertebrates, can form in high concentration. Many nitrite test kits suffer from interference