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Tetra Nitrite Test Kits
Nitrite (NO2) is a toxic chemical that is produced from the beakdown of Ammonia by biologixcal filtration. Nitrite if left unchecked will result in fish health problems. Without regular testing, the Nitrite level in your aquarium could rise to a level that is fatal to your fish.
How To Use
If you find that there are high nitrite levels, it is advised that you seek advice as to how establish the cause and also reduce them back to an acceptable level.