The first two weeks and a couple days, I used Elanore's VF-11 which is not much more potent than water. It's a .15-.85-.55 nute so there's not much to it. I roughly followed their recommendation for Hydro grows which was 45ml Elanore's/gal 1st week, then 60ml Elanore's/gal 2nd week +6ml...