Monitoring temps is very important when using those HID lights. Depending on strain these, plants can thrive in temps from 50-90 degrees F (depending on ventilation). Try to keep your daytime temps under 80 and nighttime temps over 60. Basically, if it's a comfortable temp for you then your plants should be fine. If you go into your grow area and start feeling hot and sticky, then it's too warm/humid for your babies.
It could just be the strain but the leaves look a bit spindley and the new growth looks twisted up. This could be a humidity or pH issue. Since you are using a balanced plant food, I suspect lockout. Some nutrients stay for a while in the grow medium, while others get washed out quickly.
How often are you feeding and watering?
Have you tested the pH of your soil?
Do you have anything to move air around in your grow area?
Are you growing in the open, or in a grow box/closet?
What soilless medium are you using? Looks like regular MG soil to me.
P.S.
Soilless meduims tend to run acidic (pH below 6).
