^ thats the exact setup i was talking about. i was going to cut the bottles taller so the roots would have more room, use a longer but shorter tub at the bottom, add a few of those aquarium aeration blocks around where the pump will be. i guess i know how a hydro system works but im just slightly intimidated by mixing ALL the nutrients my plants will be absorbing myself. thats why i wanted to see if anyone used that setup so i could ask what nutrients they used.