Delicious Seeds - Black Russian

I'm growing two of these Black Russian plants from Delicious Seeds. One of them is bigger and healthier, don't know why. They are next to each other. A growth spurt could hit at anytime I guess. Overall, they look great. Using an Ebb and Flow feeding with 4 feedings per day at 15 minutes each. LED lights with extra light from the window during sunrise. I've set the 18 hours cycle up so that I can let the sunrise be part of the blooming phase as well. Hope that works, if not I have thick curtains.