Well as for tthee lighting I have them on 20-4 and my thermometer broke last week and I've been meaning to buy a newone, it could possibly be the temperature as I'm growing in a chest of drawers lined with diamond foil with 2 x. 45watt red Cfl's.
There was a mini desktop fan in there too but I had to take it out because the plants were getting too close to it, but I'm going to cut intake and out take wholes in the sides of the chest and place the fan just outside so there is a more sufficient air flow and hopefully lower temps. As for the leaf curling I have no idea how it. Is happening at the start of week 3 I changed from plain tap water to adding plagron bloom nutes (5ml to every litre) and I have been feeding them 500ml each every other day or when the soil feels bone dry.
Also I have a question about the pots. You can start to see the roots on the sides of the containers could this cause problems further down the line?
Thanks for your time