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
-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?

2) Yes 3) No, but you can. I'm a big fan of pete moss / perlite with normal, liquid fertilizer - if you try to do your whole grow with Ocean Forest Soil your going to have a couple hundred bucks in dirt and still need liquid fertilizers.

OK the same setup for me just filter is the 550 and a Xtrasun magnetic ballast running a 400 watt CMH bulb. Inside the house but temp are driving me nuts way to much suction with the 6" and the four bringing in the air the tent looks like it wants to collapse even after a week with the stuff running. I am having a very hard time trying to get the in and out flows correct any luck on your setup?