Hey guys this is my first grow and first problem I couldn't figure out and self diagnose. I switched to 12/12 8 days ago and noticed the yellowing of a few top nodes. I'm growing in soil, soil ph is 6.3 and I usually balance my nute feeds around 6-6.5. They're under a 90w UFO led and are relatively close... if it could be bleaching from the light let me know but I thought this wasn't the case with LED's? It's not too warm humidity's around 40% The leaves are yellowing on the inside including the veins with dark tips but only on the new growth on the upper nodes. All the older fan leaves seem to be fine. I've flushed both of my plants with water balanced to 6ph any ideas?