My first grow and I picked a Sativa dominant and an Indica dominant. They were about 30 inches tall when I started to flower. The Indica finished at 40" and the Sativa at 60". I was perplexed at how I was going to give them even light as they grew. I had elaborate Rube Goldberg style contraptions in swimming my mind, I was ready to go to the hardware store when I shared my problem with my wife she said "why don't you just put something under the short plant to make it taller. I said that's a stupid idea, then proceeded to find something to elevate the plant.
It will be fine