Aquarium systems test kitr a new range of test kits from aquarium systems that accurately test your pondaquarium waterr use seatests no2 nitrite test kit to monitor and adjust levels of nitrites in your aquarium water thereby preventing nitrite build up and excess algae growthr the kit contains sufficient reagent for up to 140 tests and will provide accurate readings and peace of mind with your aquariumr accuracy is 005mgl