400w hps, two humidifiers, 70-80 degrees, 56% humidity, foxfarm soil, organic seed mix in cups. Everybody looks ok, some bigger than others, two transfered. just moved them today from a bigger closet into this one, and bought some myself.
You should be fine with no humidifier-unless you have R/H in the teens, you more than likely need a de-humidifier for when you start you flower cycle-30%-50% R/H with so many plants in such a limited space breathing & all increasing the R/H %.
