Bubble Kush Auto 2018/10

@weezard, well soil looks wet, which is fine as you may have just watered, However leaves curling downward and it looks a little like yellowing on smaller tips. A plant that small shouldn't be having nutrient issues in soil while so young. There should be enough in your soil to get them to week 2.5-3 imo. The two most common mistakes are incorrect ph and overwatering at this stage. So I would say its more of an educated guess. Put your finger into top of soil to 2nd knuckle and if you feel moist, wait another day and try again. Honestly at your stage I think I was water feeding every 4 days or so at 1/10 the container volume (this was past on to me by @stick). Every other day is too much, they need to dry out a bit between feeds.