sorry to disagree here, but with that good green coloring, I would say your nitrogen levels are about right ... and, my NYC diesel hybrids I just harvested had the brightest red coloring I've ever seen, the entire top 2/3 of the stems were bright red on one, and very little redness on the same plant right next to it ... they both were extremely healthy, too , so I doubt if it affects the plant much ... I have been told temperature fluctuations cause the red stems, but identical plants in my same grow, have had varying degrees of redness, with identical nutes, temps, humidity, etc.. . .. it's my un-educated conclusion that the red stems may be just genetic, as health and potency has never seem to vary for my plants, while the redness did ... dunno ... :smokin: