I don't think you need to add any of those things a couple of times per week, unless you are using a VERY weak mixture or very large pots or something. Keep in mind that too much of any of the nutrients will kill your girls. I've never added any fertilizer more than once a week, or even once a week. In face since I've started using organic amendments in my soil I only add fertilizer once at the beginning and once in the middle of flowering.