Trizzlers Auto

The plant seems to be progressing nicely, but I do have some concerns. I noticed some red stems developing on some of the fan leaves. Not sure if I should be overly concerned about that as I've read that it could be genetics. My main concern is that some of the older fan leaves are showing discoloration. Not sure if these are deficiencies or potentially nutrient lockout. Up until this week, the only thing I've done is PH the water and feed conservative nutrients about 1 time a week (starting week 5) and PH water the rest of the week. Yesterday I tested the runoff (for the first time since the start of my grow) and that's what got me worried. I feed her a 1/2 teaspoon of liquid kool bloom with the water Ph - 6.3. The Ms - 1.3 The uS - 1321 going in. My runoff levels = Ph - 5.6 uS - 3490 mS - 3.5 PPM 500 - 1790 PPM 700 - 2630 Need to educate myself more on PPM TDS and EC. Still don't have a solid understanding of those. I plan on feeding plain Ph water for the next watering and then checking the levels again and hoping for the best. As of right now, she seems to be doing pretty well overall (although the leaves are slightly on the dark green side).