Well, I'd likely let that pretty little sativa in the back vegetate for a couple more weeks to increase its yield, but those indica up front will put out some decent size colas. Remember, once the plants are given 12 hours of uninterrupted darkness each day, their hormones will explode and they'll begin to stretch like crazy. Some strains have been known to more than double in size during flowering. However, it is advised that you keep stretching to a minimum as you want the shortest distance between internodes as possible to keep your buds compact. To minimize stretching, use lights stronger in the blue spectrum for the first couple weeks of flowering before switching to lights in the red spectrum to finish the flowering phase.