Tetra Test NO3 Nitrate, 45 tests:
Nitrate (NO3-) is produced from the breakdown of nitrite in the filter. Nitrate can be harmful for marine fish, and high levels may indicate a general decline in aquarium / pond conditions. The only way to determine the nitrate level is by testing it with a TetraTest Nitrate kit. Regular testing will help you to assess the overall health of the environment and avoid any problems.