Greatest New Year's gift: Critical Sour

I decided to top the one I'll keep at the end of this week on day 21. I'll also be feeding it for the first time that day. I decided to go with Advanced Nutriments: Grow, Micro and Bloom to keep it simple and i'll be going with the recommended dosage. EDIT: Day 21, I had to top the plant I'll keep and wanted to start feeding her but the shipment of my nutrients has been delayed, so until they arrive I'll give her the basic Miracle Gro 20-20-20 water soluble I got left. 22ml for 6L. Next week I'll start bending. Some of them are growing faster than others and I really don't know why since they're all done the same way. EDIT: I learned about phenotype later I bought a light meter and optimized my lamp set-up to find the sweet spot for the 4 plants, that meant raising them to 60 cm from the top of the plant. Fortunately I have those locking hangers which makes the job really easy. I also bought a PH meter and discovered that my soil was at around 7.5. I say around because it's far from a precise one. I'll spend a few bucks to get a digital one and buy some PH down and up. EDIT: Digital meter came in and read 7 so I'm good, i'll try to lower it just a bit though I'm now trying to find a better home for my three offsprings.