Leaves curling down at tips

Feed with half the nutrients before flush then creep back up it will tell you what to do

Because your girls are under leds, the soil still was wet enough and u should waited a little much longer for next watering session. I did the same, u can check my OG Kush Auto Diary. Another thing is the ventilation. When u send air directly to them from a fun, it's not ok. Air must come indirectly.

Ahhhh the clawwwww hahaha I remember that film Liar lol the other growers are correct though i feel both of them have not mentioned the other half of this problem which is overwatering :) Take it easy on the watering can my friend only water when the medium is dry :) Its all good advice though :)

Agreed. excess nitrogen. Since you used only water its most likely you have a salt buildup in your soil from either to much food or not watering enough between feedings. So when you watered it released the nutrients. Dont try to wash them out as it will most likely mess up your soil. Stick to water for the next little bit. And like couplethatgrows420 said if you have a PPM meter check the runoff to see how much it increases to get an idea of how long to keep watering before your next feed. Happy Growing

Yeah looks like a nitrogen issue to me, should be ok though just feed water for a feeding or 2. I would also feed ph water until runoff once and check your PPM's in the soil.