CoiceNugs, if your comment about not worrying about the yellowing I saw was for me, then that was my fault for not giving more details. First of all, for lights I use nothing but cfls, with cfls all around the plant, so all the leaves get about the same amount of light. The yellowing was a concern because it was much more than the 'normal' yellowing that occurs during flowering. It was progressing so fast, I was afraid I was going to loose all fan leaves in about 10 days. It definately was N def, but I believe it was caused because I started feeding the plant the flowering nutes as soon as I changed to 12/12, instead of waiting for the plant to come out of its veg state. The nutes I mentioned have a lot of N in it for flowering nutes, but not enough for a vegging plant. After giving these nutes to the plant two feedings in a row during flowering, the yellowing has stopped, or at least slowed to more of a 'normal' rate. Anyway, thankyou much for the suggestion.