Thanks for the quick reply. Ebb and flow for sure. I added some of those extensions and screens before I "clicked". I've heard good and bad things about screens. Some say later in the grow a leaf or I was thinking roots might get in the tube and cover the screen and flood the room. Guess that's just a maintenance issue. Scrubbers I'm not worried about but have a power strip in mind. Also planning to drill a hole, get a 400 watt from HTG with a vented hood. I was sitting here drawing myself little pictures of the tube and where to drillthe holes. I divided 48" by 3" net pots. From the end that left me with on center drilling at 6 1/2", 5 1/2, 5 1/2, 5 1/2, 5 1/2, 5 1/2 leaving me 5" on both ends. I know I have overthought this and like I said before I'm not handy with tools! LOL!