looks sensational! do you water them like regular plants, pouring by hand directly to the plants root or have some kind of automation system doing the watering there?
Hand watering 4 times a day, two shot glasses each time. ~300 ppm General Hydroponics 3 part nutes, pH 6. In a week or so will start auto fertigation, 5 mins every 3 hours, and will up the ppm to ~600. I'm a rookie mind you, and making best guesses only. 420 is the dood.