if i was you i would keep the tubing below the plants becouse its the under side of the leaves that take in c02,the oxygen wich the plants produce will rise and hopefully you will have some form of venting at the top of the grow for oxygen to leave.keep any fans below the plants aswell alought this is not crucial for most plants but in your grow room it will help the air flow,and the hummidty.
sam111 Reviewed by sam111 on . Gone into bloom, time to share. Right then, After scattering questions and pictures across several boards, probably in the wrong place, I've decided to roll up a chonger and bring it all together here. This is my first grow, and many mistakes have been learned from along the way. 26 Sept. I started with 3 'four-way' seeds, planted straight into soil propogation blocks, 2 germinated and were transplanted into houseplant compost under a (wait for it) 500w halogen security lamp in my wardrobe. They didn't like that, Rating: 5