greetings...

i have sum questions rollitup, hopefully u can help

i am setting up a sea of green t.a.g. true aeroponic medical grow with about 20-25 plants...straight to 12/12 flower from rooted clones.....question 1) how many feet long (minimum) should my reservoir be to allow the roots to hang throughout the whole 8-9 week grow?.... 2) how far apart (inches) should the plant sites be (average or minimum)??..... and lastly, how tall might the plants get considering 'no veg' time (expected or average)???....reason being is that i have read that 600 watt lights reach about three feet down, while 1000 watters penetrate four feet down.....soooo, r the bitches gone to be 2,3, or 4 feet long? thnx for any and all help