Red poison Auto

Ok the first week I had some problems. I have never grow organically before and wanted to. I wanted to be easy on the nutrients because I was using BIG ROOTZ soil. General organics line, if you only use bio weed or bio roots, oh is CRAZY LOW. Beware! I tested the bottle of nutes and was getting 2.2 PH. And mixed with RO water it only came out to 4.1. So I mixed tap water to it to make it rise because I was out of ph down/up. I got some yellowing. But was able to work it out. I am doing 1 red poison in soil. And one in coco. I'll log it in a different diarie.