everything sounds ok....except for the fact the poor wee things are freezing their asses off....hard to see from the pics wot type of system u r using....if using a recirculating set-up, the nutes need to at about 28 deg. C (about 80 F or thereabouts) giving them a feed every hour for 15 min when the light is on will help keep the roots warm....they are also getting a bit tall, you had better do something about that, either tipping(topping) or tying the tops over (LST)....how close are they to the light(s) ?? with 400's you can get them fairly close....about 40cm (16") or so....I'd probably also think about insulating the grow room as best I could....and go full strength with the nutes....& make sure they are flushed well with warm water once a week....but definitely try to get them warmer.... :greenthumb:
good luck with yer grow dude....:stoned:
:hippy:
Slayer