Side Leaves curling

Hey, im growing with 6 tube floresent lights....about 3 inches away from the plant. the temp in my room is 77 humidy about 30% im not sure what going on here the plant seems healthy and is growing fine, but none of the other plants are showing this..

It most likley is overwatering... and it maybe is to hot in your set up.... So you might want to check the temp.. and while watering just count to 6 sec and stop try and get as much as you can in withing thise 6 sec. and when you dump your water in is your soil sinking into itself? is so then its not due to overwatering. If its sinking into itself it underwatering make sure you have enough holes in your buckets to let as much excess out...

my bad did not read the 3 inch part.. the light is to close.. its too hot bro try cooling dow your spot to at least 72 degrees and do not spay water on leaves. but looks like you problem is the light man to close.... hope I helped. and always PH the water. or get a jug of water in an open container and let it sit for a while a few days and that should delute the waters....