Hi all, im planning on a starting a new grow room, i have a 6ft x 3ft hydroduct nft tray (http://www.growell.co.uk/p/1020/Hydro-Duct-NFT-Systems.html) and 2 600 watt lights, i was planning on 10 plants (5 each side) and was wondering wether to train them all to a certain height and if so what...