This nutrient calculator is to aid you in calculating how much specific VitaLink nutrient you need for your tank. Before doing this, it is important to ascertain the volume of solution to be used in your tank, so your calculation is correct. Please note that this calculator is only to be used as a guideline.
Your pH should be between 5.5 and 6.5, with it generally being around 5.8. This means that your plants have everything available to them that they need.