Hi im very new to all this and this is my first grow, I've got 5 auto big bangs under 600w hps ,32 inch away from top of plants, got a computer fan on high in the tent to circulate the air and 2 vents open at bottom. The leaves are curling up. Any ideas what this could be? I've been reading up on other threads and I think it could be root rot?
First picture was yesterday
First picture was yesterday