I am a new member. I am a California medical marijuana patient. I have been experimenting with growing aeroponic, have taken some knocks, and am almost ready to build my system. I will have a high-pressure pump feeding nutrient solution to mister nozzles. The mist generated will be pumped through the root zone of 6 plants by a waterproof fan (looking into a duct booster). What I can't find, and what I need to know to build, is how much root space do I need? My root tunnel will be fully drained and will be 18" deep. I need to know is will a tunnel one foot wide due or do I need two foot wide? The one foot wide tunnel will be a much easier build because two side by side will be smaller then the "room". If I go two foot wide it will be like building a ship in a bottle. My plan is 6 plants in a "room" 4'X8' 7'2" tall (4 to 8 sq.ft. for fans etc.). That makes a finished plant 2' dia. by 3' tall or a little larger because I need 24" for root space and drain and 2' light clearance (1000W HPS in a cool tube). Any help will be appreciated.