Sensi skunk fem

First time growing! Ordered some seeds from sensi seeds to see if they’d actually arrive!! They did all 3 seeds germinated! One sees I soaked in water for 36/40 hours then planted in a 70% coco 30% perlite mix! Other two seeds were planted straight into the pots! Amazing enough all popped up. Only watered no nutrients! They were kept on a shelf under a old uv fish tank light! Still not sure how this system works