my first grow room (tent) review / and a few questions

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
-6â?� 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?


cheers

I planted some autoflower seeds in ocean forest which are about 5 days sprouted and they seem strong and healthy as can be, I also water with 6.4 phd water with 2 drops of superthrive per gallon. That is just what I do and it seems to be working. I also started a bubba kush seed in ocean forest ( first dirt attempt, hydro guy) which is just aproaching 8 weeks of flower that seemed to do ok.