Ur yellowing is normal from wat I can see. Its wen the yellowing starts in week 1 or 2. Yellowing from the bottom is a good sign. If u are yellowing at the top then u have a problem. The best thing to do is look and take pictures of your plant periodically, every 2 or 3 days so u can compare the growth, issues, and problem. It's a bitch organizing all the pics, so wat I do is stay on top of it. I am color blind of green. So seeing diff. colors of green is difficult. You can always add nitrogen to ur flower. As much as everybody says a plant doesnt use it as much and doesnt need it, why? I think the biggest thing is figuring out when to flush. I have had plants done after 50 days and I have had plants take 10 weeks. I even have a 100x hand held scope. My biggest problem with this is the first couple of plants I had I was learning wat they are and do. Right now I have an Afghan that is definitely an 8 week flower. So I will hopefully plan accordingly. 7-10 days of flush, which would be 4 or 5 waters. I have small grow rooms with one plant and a lot of air flow. So the soil dries out quickly. So maybe I should flush at 7 days before. Then u have to do 48-72hours of darkness. Do u feed during this?