Brock, you see those little sets of leaves coming out of the crotch of all the big leaves? If you tie your plant over (low stress training) all those will grow up toward the light and form tops. Wait til they get a little older though. Check the pics in my grow log (link in my signature) and look how many tops they formed in the week they were tied down . It also helps distribute light evenly to the whole plant since it makes the canopy even instead of having one part up top close to the light and the bottom of the plant far away.