If I had a little more info I could help ya more. Like, are growing a clone, seed and at what stage and what medium are they growing in?
Sorry but I dont use Fox Farms (personal reasons).
This is how I do it and have done it:
Bio-Bizz All Mix Soilless soil. My new crop will be with Roots Organic Soil
For the veg and bud cycle I use store bought Spring H2O. My City H2O has a pH of 8.
I bought a soil moisture meter, about $5. When my soil is dry for at least a day, I then water the soil real good.
It is about every third day that I water and I add a little nute 1/10 streangth every time. Once a week on Friday, I give a 1/2 streangth dose. I also add a few other things but you dont need to.
My nutes are as follows:
Supernatural Grow Terra
Supernatural Bloom Terra
Botanicare Pure Blend Grow and Bloom
Advanced Nutrients Bud Blood
Advanced Nutrients Big Bud
Advanced Nutrients Overdrive
Banana Manna
When I turn my plants, I use my three part program, is that like your three part program or do you have part one for your veg?
During bloom: Same watering pattern but I use Bud Blood for two weeks in ever watering and I give em a dose of bloom terra during this first two weeks. Weeks three-six I use Big Bud every watering and the same pattern, let em get dry before you soak em! Week seven the girls get hit with Overdrive and a dose full dose of Bloom Terra on day one of week seven.
Week 8 Day one, Overdrive, then if they dont need H20, they dont get it, just a good chop at the base at the end of the week. I dont like my week 8 buds droopy from lack of H20 and I dont like to stuff em.
Oh, cut the girls down in the dark just before the lights come on.