Seachem Flourish Nitrogen is a high quality nitrogen fertiliser for aquarium plants. It contains a blend of nitrate and ammonium to optimise plant growth without polluting the water. The controlled dosage allows the aquarist to precisely control the nitrogen level in the aquarium and prevent deficiency symptoms. Seachem Flourish Nitrogen is safe for fish and invertebrates and is particularly suitable for planted freshwater aquariums.Nitrogen is one of the main three macro nutrients (nitrogen, phosphorus, potassium: NPK) required by plants and can often become the limiting factor to growth in a flourishing system. Flourish Nitrogen is a concentrated (15,000 mg/L) blend of nitrogen sources. It provides nitrogen in both the nitrate form and the plant-preferred ammonium form. However, no free ammonia is released because the ammonium in Seachem Flourish Nitrogen is complexed and unavailable until utilized by the plants. Ammonium becomes available after conversion of urea (carbamide). Seache