I would grow small plant's maybe clones bud on a stick style in that system... If your gonna grow that way from seed I would suggest doing one plant per tub unless you plan to move them quickly, the roots will begin to grow together, if you have a male in the bunch removing him from the girls will cause damage to their roots, and if you cut him out and leave his rootball it will rot and cause problems to the girls in the root zone. Just my two honest Abe's...
D:S5: