one hell of a room ya got there, you sure did bite off your share of work being your first grow, i hope all goes well

what are the dimensions of that room? do you plan on sectioning off for a mother plant and propagation? man you could have one serious garden

i have been planning on setting up a room such as yourself, if i were you i would scrap the ebb and flow and do some grow bags with a top feed injection kit with a coco fiber, perlite, peat moss mix, i wouldnt cram them together space your plants out giving each like a 3x3 area with there own 400watt hid, man plants get so big when there not crammed i bet you could easily get close to a pound per plant

hows your enviroment? is that a sealed room? id love to help any way i can