For a salt water tank, it is crucial to maintain nitrogen levels in balance with phosphorous for optimal growth, and coloration of both macroalgae and corals. A typical nitrate test will show all forms of nitrogen being added by Reef Nitrogenâ¢. Reef Nitrogen⢠is ideally suited for use with an aquavitro® sentia⢠dose doser to maintain nitrogen at consistent concentration based on your aquarium's unique demand. Reef Nitrogen⢠is easily dosed manually as well.