My bad, I forgot to mention that I added 20% organic perlite to the soil. The light is so close to the seedlings because they had been tilting toward the light which at the time was HPS. Once I realized how much of an impact HPS had on autoflowrers, I immediately went online and purchas a new 600w metal halide bulb. This morning I noticed that two of the seedlings starting tilting towards the opposite direction of the last light (assuming it might be because MH is working better?) so I brought the light to 18 inches away from the seedlings. Although heat was an issue, I don't believe it's what's causing the leaves to bend. Any other possibilities?