The cannabis plant thrives in soil with a PH of 5.8 - 6.3

HOwever, I do not use a soil PH tester. $250.00 for a good one. Fuck that I can buy a bag of some good shit with that.

I simply make sure the water I use has a PH of 6.3 when water them.

Two times, I have watered with regular 'bottled water' with a PH of 10.0. I figure if the soil gets too low on PH it will lock up the nute intake of the plant, so twice I go on the high side.

I cant help with your fert as I havent used it.

I have always understood, you use i/2 to 1/4 of what the instructions call for on using ferts. You can always under do, but usually only overdo one time.

Hope I could help a little.

Happy Growing.