Pre packaged soil is loaded with nutes to begin with so take that into account. CNS 17 really should be posing no problems for you unless somehow you were really really over doing it, and you'd have to be doing something crazy to just really over do it with any phase of cns17. I use cns 17 grow through ripe, liquid karma, hygrozyme(ONE OF THE MOST IMPORTANT THINGS), raw sweet, botanicares organicare calplex(smell it and you will know that you want to use it), organic wet betty(foliage, some in the nutes every other week), hydroplex to help out in later weeks, handwatered silca blast every now and then(its awful mixed with your nutes, sludge in your feed lines) and I'm looking to fit organicare seaplex in most likely for foliage given the LK in the nute mix. Aerate you water, find a way of introducing co2(shoot for 1250ppm and you will see what 46 bux a week in co2 will do for your harvest.). Thats how and what I use with CNS17 as my base nute and i'm happy.