Unknown Auto and Photo

Day 57: watering (sunday) pH: 6,6 EC: 1,76 Day 60: Photo: (73 cm - 77 cm) Auto: ( 48 cm - 75cm ) Some smaller some bigger not all as vigorous on start up. Some pheno were noticeably more vigorous than average on start up. Some noticeable differences amongst phenotypes on start up. They show some preflowers since third week of veg. 6 of them seem to be flowering faster than they should, so they must be Automatics and not photoperiods. Pheno 1 & 8 are photoperiods (plants on the left) while all others pheno are automatics. I got in touch with Nirvana, they've sent me another batch of 10 Bubble Kush seeds. There is differents shade of green for the leaves amongst phenotypes. From very dark leaves, to some intermediate greens and some phenotypes already fading. Like last grow some of them tend to fade a bit too much a bit too early to my taste, i'm trying to figure what's wrong as i didn't change anything to my growing routine. I suspect the clay pebbles bottom of my pots might need a flush. Day 62: Watering (Friday)