Features: A liquid concentrate that gives corals vital nutrients For their metabolism and the metabolism of their zooxanthellae, corals need specific minimum concentrations of phosphates and nitrogen compounds in order to flourish. These compounds are especially likely to be lacking in very low nutrient aquariums (ULNS = ultra low nutrient system). These phosphates and nitrogen compounds are supplied by Tropic Marin® Plus-NP in concentrations that are specific to the requirements of the corals. Corals can use nitrogen and phosphates more effectively than inorganic nutritional salt additives because they are bound by an organic energy source. This method prevents nutrient deficiencies in the corals, restores growth, and reduces the amount of nutrients lost due to denitrification and adsorption. Plus-NP liquid concentrate is simple to use and