400w HPS growing in coco help preparing please .. few questions

whats going on guys thanks for stopping by my thread.

im getting ready to start a pretty legit set up ive been working on for some time now and im in the final process of going about buying most of it and ive decided on AN sensi grow & bloom a+b , and will be growing in either 100% coco or like a 70/30 or 80/20 ratio of coco and a pro mix soil i have left over.. (to reduce waterings slightlly and give roots and nutes more to "hold")

SOO .. with that being said i realize im going to need to manage ph a and ppms with my feedings and runoffs. i would love and appreciate so much if someone could run me through the most basic method of doing this. what should be my ph for nutes and ph for water? what should be ppm for nutes vs when i water with clean water? do these values change as the plant matures? also if anyone has a link to a well or personally known brand of equipment to use for this that would be SO GREAT.

i really need some help w this as im a noob and my first grow was a fail. (in my defense it was heat issue) lol but i hope someone has the time to leave me some advice. PEACE!

Originally Posted by patlpp

RU using PH-Perfect Sensi?

nah i actually was just gonna grab the regular kind.. i figure im just gonna end up ph'ing it anyways.