So 2 fans (One for intake, and one Exhaust/cooltube) will be all i'll need? I won't need another exhaust unless heat becomes more of a problem right? And i can use the fan for both intake and exhaust?

Thanks for your advice guys!! I can't explain how much your help is appreciated!
InTheTrees Reviewed by InTheTrees on . ** Will this work?? Come quick, order on the way! ** Im growing in a homebox xs (2x2x4) and im growing buddha white dwarfs (From ) they will be under a 250w hps with a cooltube (from htpsupply?).. Well what im asking is would 1x intake 6'' inline fan pushing 250 CFM (cubic feet per minute), and i have 1x of the same 6'' fans on the cooltube.. Will another 6'' fan of the same one work?? Or would i need more?? Here is the specs of the fan.. And will i need 2x fans for my cooltube (One sucking in and out) or what?? PLEASE HELP ME! Heres specs Rating: 5