Green crack

Obviously starting this journal in the 3rd week. I'll be growing 3 strains in the flower room when it's time. This journal will cover the 2 Green Crack plants I have out of 6 plants total. 3 Crown Royale and a Purple Kush will be roommates as well. I started with 3 fem seeds from crop king. Only 2 grew tap roots. They were potted into red solo cups when they were a little over an inch long and broke dirt a day later under a fluorescent light for their first week of life. In week 2 I got the veg room up and running and fired up the monster 1000 watt mh light. I know its overkill for the plants at this stage but I cant afford to buy another light yet and the 2 1000 watters are all I have right now. They were potted up into 4L pots and given a bump in nutes from 1ml/l to 2ml/l. Roots were strong and healthy and ready for their new home. On week 3 I topped both girls at the 3rd node(or so I thought). More on that later. At this point I had been trying to raise the ph in the pots since I had been testing at just over 5. From what I've read Promix hp has lime mixed in it and should naturally raise the ph on it's own. I pre soaked the promix a couple of days prior to transplanting into the 4l pots to activate the lime but my runnoff was still low. To counter that I have been feeding them at 6.5. There was some discoloration on the bottom fan leaves and I was worrying already about deficiencies. Being my first grow, every discolored leaf is like a dagger in the heart. Lol.