Hi all, So my first grow room (tent) is nearly planned and would like to run it by the forums: -DR120 II (4x4x6.5) -Quantum 600w ballast -Radiant 6" air cooled hood -Ratcheting light hanger -Horilux 600w HPS -6†vortex (456cfm) - cooling the light (question 1 below) -Fan speed controller -6" vortex (456cfm) - cooling the tent -Fan speed controller -6" ducting (I shouldn't need much) -Oscillating fan -400cfm Presh carbon filter (question 2 below) -Temperature/Humidity Meter (Recommendations?) -ph tester (Recommendations?) -Fox Farm's Ocean Forest Soil (question 3 below) -Nutrients (Undecided) -pots - of course Questions: 1.) It's been indicated to me that when using an air cooled hood that 150-250cfm is enough to cool the 600w HPS, sound right? I'm thinking that one day I might have a veg tent and a flower and that by over sizing the fan I could use it to cool both lights, sound valid? (For now I would run the Vortex on a speed controller) 2.) I don't expect to be running the fan that cools the tent at full speed, if I run it at half speed (~200cfm) then would carbon filter rated for 400cfm still work? Thought>>> Should I just simplify the whole thing and cool the tent through the hood/light? (carbon filter > hood > fan > vent) I think this a more common setup, yes? 3.) I haven't fully searched the forms yet but I thought I'd ask anyway. As I understand it "Fox Farm's Ocean Forest Soil" is pretty nutrient rich should I be starting my seedlings in a less rich soil?