Awesome grow, description, pics, and updates. Thank you so much for the thread!
I definitely plan on getting there, ATM I am using a 1000 for the first time, and my room is about the size of yours. I guess my goal is 2k and a tray with the 'ton as media.
I've used hydroton with good results in buckets, but never in trays, recently I saw an aquaponics setup like that and the hydroton were doing great as a medium.
I'm guessing you use R/O water and do you do anything for humidity control?
Do you use sulfur etc, do you spray or use any pest control in veg etc?