HELP!! WHAT KIND OF WATER AND NUTRIENT ISSUES

Hello all.. I was wondering what kind of water I should be using for my setup. I'm using PROMIX HP and I have currently been using R/O water. I read somewhere that R/O water is not necessary for promix but I'm not sure. I would love if someone could tell me from experience what water works best for PROMIX HP.. Ok on to my other problem. I am using TECHNAFLORA NUTES ( BC GROW, BC BOOST, etc..) and I am constantly having issues and deficiencies. I PH my R/O water to 5.8-6.2 every time and use a feed, water, feed system. My leaves turn yellow, brown, dark spots in the center and they get real real dry and curl up and then eventually die and fall off. Some of them have tiny yellowish brownish reddish spots all over the fingers. And a couple of my plants leaves feel like sand paper and some of the girls stems are reddish purple. I have tried to correct it with CAL-MAG but it's not doing the job. I can post pics in a little bit as I'm sure that will help.. SOMEONE PLEASE PLEASE HELP ME! This is my first grow and I'm so lost and frustrated
 
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