Yellowing leaves spreading with pics! PLEASE HELP!!!

This is my first grow, an autoflower AK47.. she's 6 weeks old.. About 5 days ago i noticed the bottom leaves turning yellow.. I thought maybe the plant just didn't need them anymore.. Now it's spreading to the top of the plant and the tips of the smaller leaves are turning a bit yellow... I used nothing but distilled water for the first 5 1/2 weeks, because I am using MG Organic which has nutes, but a couple days ago I watered with 1/3 FF Big Bloom.. I began using 4x26 watt 6700k CFL but since she showed her sex I have been using 1x26 watt 6700k CFL & 3x26 watt 2700k CFL's in a 1x2 tiny grow box.. pH has been around 7-7.2 the whole grow and lights have been on 24/0.. I know she's pretty short, but its my first grow.. here is a pic:

lower your ph to between 6 and 6.5 she might not be taking up enough nutes because of that. also, mg is not the best of soil it might need a little nitrogen boost (it looks like its pulling N from the lower leaves) since you started with bloom nutes - go get some age old organics liquid kelp its like 8 bucks and make a foliar spray with it using the directions on the back. (make sure to spray when the lights go off) that bud looks good tho, go to home depot and get a 300 watt 2700k cfl its like 14 bucks and you're gonna need more light.