Ok so heres how I do this. Im a Fox Farm user myself. I slowly work my way up to 1 tablespoon right before and up to the first or second week of flowering. Let the plant tell you how much food she needs. Nitrogen is a mobile nutrient. That means the plant will take the N and move it throughout its many fan leaves, using the energy where it is most needed. If you Have Yellow bottom leaves or fading leaves, you are running out of nutrients. Now if the tips are burnt or yellow/brown then you need to ease up on the food and flush. And flush good. I fnd its important to flush the tiger bloom out at the end but not everyone will agree with me. Im just offering you my 2 cents