Well with a 150w I plan on useing a 2x2 foot area. I dont have unlimited vertical height. I have more than enough to accomodate my 150w grow. I was suggested 3 plants in a bubbler and I think that sounds good. Now I jsut need to know how big of a tub I should get how many gallons? How big I should let my clones get before I put them in the flowering chamber if im growing an indica dominant plant?