To keep it simple, the Lukas Formula basically turns your ferts into a 5-5-5, 5% N, 5%P, and 5% K. It only uses the micro and bloom, no grow. So if you want to use other fert brands, just look at the two in the series that will give you a bout a 5-5-5 ratio. If it gives you 10-10-10, that is the...