I have several plants that are approximately 3 months old. All are growing outside and gets at least 7 hours of direct sun. All are doing very well, but one has odd coloring to the veins. They are a bright yellow, just the veins, not the leaf. It's getting the same fertilizer as the rest. I use "Great White", once or twice a month, I also use general hydroponic maxigro once to twice a week. With normal tap water used in between. What could be causing the yellow veining? Once I can figure out how to post a pic, I will. Thanks, peggyk