Yellowing of Leaves ?

What pre feed is in your soil? I did not see any nutrients in the diary? They should not need any food just yet unless the medium it started out in depleted. Some autos will also just be picky and grow a few inches and bloom. But I have found they do not like a much feed as Photos and are more sensitive to high stress training/transplanting and only gentle LST should be used on them. The dark green on the leaves suggest its getting enough nitrogen and and yellowing may look like hungry but I don't think it is. If anything when its ready for feed use less. Also last note, I find with autos being so picky they like soiless more so then soil, but this could very well be my own bias. I can only speak from my own experiences.