Blue Cheese Automatic

I've put 3 seeds between saturated paper towels and put it in a box. 2 days later all 3 seeds were cracked but only one was showing decent tap root development. Since I'll be going away for a few days I've planted all seeds in their respective 19 liter plantsack container, gave them water and nutrients (Advanced Nutrients Jungle Juice: 3.3ml of Micro, Grow and Bloom in 10 liters of water, spread over the 3 plants) and put a dome on top to keep humidity levels in balance The coco mix I'm using is from Cellmax, which is prebuffered with calcium and magnesium. I've flushed the soil twice with nutrients, leaving 8 hours between flushes, just to be sure the plants get the best start regarding nutrients