i personally would put 3 plants in there giving each one 2 square feet, which will probably yeild you little over a qp per plants if you have a pretty stable enviroment, you could push 4 but you gotta understand the more plants the less room for light to penetrate the canopy so you will still hit close to the same weight as 3 but with smaller underdeveloped buds, with less plants you will hit the same weight but with bigger higher quality buds, if you read my original post i stated i was gettin a half pound to 3/4's in half your space with 1-2 plants, but please dont do six, i would veg 6-10 and wait to see who flowers first and keep 3 pheno types in your space