curling leaf`s

[flutefixer]

my 12 and 12 plants have been in the e and f system for 12 days now, the growth rate is awesome, a couple of leaves on a couple of the plants are curling up around the edges of the leaves, I am using a 1000 watt light advanced nuts, the humidity is around 60% the "daytime" air is 82 degrees, night time is around 77 to 78, the ph is steady at 5.6 and the ppm is between 900 and 1000, the light is aprx 24 inches from the tops of the plants, any ideas are really appreciated. thsnks

 

[HoppyFrog420]

need pics.. its hard to diagnose anything without looking at the plants.