Curling of the leaves

Im doing a 600w HM (Veg) / HPS (Flower) Grow. Its a NON-recirculating DWC, basicly 5 plants sitting in five 5-Gallon Buckets /w airstones and airated water. But The Problem Im Having Is That My Leaves Are Curling. Never Seen This Before. Also working with a new grow room so i have a completely different environment. But my leaves look just like this... (see pic below) and i want them 2 be straight! what do i need 2 do? also will 1 600w mh light be enough 2 grow a scrog of 5 Herojuana OG plants?

thats a heat related problem,also if leaves claw down its a watering to much problem,how far is your light from the top of the plant, & your 600 hps is well enough, ive grown 5 blue cheeses under a 250 hps closet grow and got good results,it all depends how you distribute the light tha you have available

wats your room temps lights on and room temps lights off