Potassium (K) is extremely important and easily depleted in a planted tank. In the growth stage, rate of plant growth is evident with a higher content of K. In the maturing stage, K is helpful in color development.   In growth and maturing stage, Potassium is needed.   Direction: Tabs are to be dosed directly, please refer to the dosing table. For growth rate enhancement, use with Nutrient Nitrogen(N) and Nutrient Phosphorus(P). For color development, use with Nutrient Iron(Fe).