downsize.jpgThis is my first grow. Its based on the research I've done from the internet. Metal Halide 400 watt, 80 degrees roughly, around 50% humidity, I'm only using Miracle grow organic choice as of right now for soil, and I haven't added nutes yet. My plants are ak-47 feminized, roughly three weeks old and about 6 inches high. I water with distilled water. The new growth looks very healthy on the plant but as the leaves age, the tips become yellow with the very end a darker color.....any ideas? N deficeincy? Too much N? Any suggestions are greatly appreciated.