I've got 18 seedlings and in using fox farm happy frog soil and fox farm nutes and open sesame, beastie bloomz and cha Ching. I've got the nute and ppm down. The ph of the soil and nutes are good. My question is the ppm range goes from 350-420ppm in week 1 then in week 2 it goes to 1540-1680 ppm. How do I control this? I've had very successful grows in the past but this time I'm growing medical grade and I want to this by the book. In need of assistance of a guru ✌