Nitrogen, phosphorus, and potassium (NPK) are the three main macro nutrients required by plants and can often become the limiting factor to growth in a flourishing system. Seachem Plant Pack Enhancer NPK Level 2 combines Flourish Nitrogen, Flourish Phosphorus, and Flourish Potassium in one pack with a content of 100 ml each.Seachem Flourish NitrogenSeachem 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 Flourish Nitrogen is complexed and unavailable until utilized by the plants. Flourish Nitrogen also provides nitrate for those plants that can readily utilize nitrate as well.Seachem Flourish PhosphorusSeachem Flourish Phosphorus is a safe solution of potassium phosphate that takes the guess work out phosphate dosing. Unlike competing products that mix nitrate and phosphate in a fixed ratio, Seachem Flourish Phosph