I will be scroging and I have eight babies on 4x4 aero tray in 3" net cups with coco liner and hydroton. I will be building a screen today that will sit over the tray at 8-10 inches I will probably do a 6x4 as well(natural high) instead of a 5x5. the lights are 2 600 watt hps with mh conversion bulb for veg. and hps for flower that are ac by a 6 in vortex fan vented to the attic so I have them 30 in away from top now but will lower as plant and root systems develop to get as close as I can what do you suggest? also there is a chiller keeping water temps to 70 and ac keeping room at 77