Ok so under 8 25 watt 1500 lum 6500k CFls about 3 " away. Temps are good also have a fan door is open pretty much all day. About a month old growing in coco. Using house and garden a and b 5 ml each per gallon with .ml root excel and 5 ml cal mag per gallon.. Feed daily with 20% ish run off. I'm thinking there is too much nitrogen.. As some plants are very dark. Getting digital ph meter this weekend as I think this could be the issue but I do keep the drop test around where they say is 5.8 know it's not perfectly accurate.