 nitrite test kits are an essential item in keeping an aquarium. Nitrite test kits are an excellent guage of how well you filter is processing fish waste. Once the colour of the nitrite test kit has become clear then your aquarium is safe to add a small to modeate amount of fish.
Everyone should use a nitrite test kits to intially make sure your aquarium is working and that the filtration is continually working. Nitrite Test Kits are easy to use and usually require only a few drops of 2 liquids and then match the colour to the colour chart.
If your nitrite does go up above zero then an immediate water change is required and adding of a biological filter medium to the tank is highly recommended. keep retesting with your nitrite test kit until your aquariums nitrite level go down to zero. | 
