I'm new to growing so i can't answer some of you questions but i can get you the nute guide ive been using and i haven't had a problem yet. I got this from a member of the AFN website.
Week
1 pH water only
1.5 add in Big Bloom to the mix at 1/2 tea spoon
2 1/2tsp Grow Big 1/2 tsp Big Bloom...