Easy ryder grow (problems with leaves)

Hey all,
I currently just started growing some easy ryder seeds. I've grown them before so its nothing new. I just started noticing my leaves curl up a bit and im not sure why. Does anyone think this is a heat problem? My grow room stays anywhere between 75-80 degrees. The highest its been is about 83. I started them off in 3 gallon containers in fox farms ocean forest soil mixed with fox farm light warrior. The PH for my soil and my water are about 6.8 so theres no problem there. What does anyone think? One of my little ones looks like he got one of his leaves really burned. And also, i do not spray my plants with the HPS on. I havent sprayed them yet with any water. Any good answers with get +REPS.

You should answer yourself what you are doig diferent from previous grows. I's definetly nutes burn. Maybe soil is to fertile. About a month ago i had the same situation with auto lemon skunk and transplanting to diferent soil (this time organic) saved my baby. Wish you luck in these hard times

I don't see anything wrong with those pictures, but I am assuming the "yellow" looking leaves is just the light/camera...since all the other plants look perfectly fine...