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hey
I hope you are aware 18/6 or 24 hours of light is best....soil or hydro...
i believe 60 cm is about 3" thats way to close for a 400 watt hps... should have started it around 18" then lowered it slowly over a couple weeks, I also see you had vents but did you have any current on the plants? oscilating fan? no movment caused dried leaves...
I cant really see the pictures well but it would be my guess a couple different issues caused this...Is the bio super mix the ferts ur using i see no mention of others...
I believe the guys in soil keep thier ph a little higher.. 6.2 but dont quote me..
, need to look that up...
Id move that light up 18", give them a good flush (distelled water) then a very low mix 25% of some ferts with nitrogen. If you try to clone them the clones probably wont survive they just dont look strong enough..I dont see ph issues so my best guess is they are either sunburnt and starved, or sunburnt and overfeed.....
The leaves curled like that unfortunately only narrows it down, could be the strain, over water, underwater... so thats all i have man,,, more info ill try to help
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perpetual harvester
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