I’m using a HLG 600 rspec inside of a 4x4 grow tent. I had the light about 20 inches from the plant but I moved it to 36 inches away about three days ago when I noticed the yellowing
I use mother earths coco 70% coco 30% perlite it’s in week one of veg and I’m using tap water with a ph of 5.6 to 5.8 and I water when coco is almost dry I mixed Gia green 444 all purpose with worm castings before I planred the seed.