How important is Co2?

[Smokealotapotamus]

this is my first grow and was wondering if i should buy a co2 boost from here http://www.co2boost.com/ ... is it really important or could i grow without it? im on a really tight budget, but i want to get the best from my plants. also, can someone recommend what kind of fan i should use for ventilation in my closet, 2'W 9'H, 10'L witha 400 watt mh running... thanks :thumbsup:

[The_Chronicler]

Dont bother,, unless your room is sealed. Its just a waste. Instead,,concentrate on having the best intake and exhaust fan than you can afford. Intake fan in the bottom opposite to your exhaust fan on the top over your room.

[Smokealotapotamus]

what kind of intake and exhaust fan would you recommend i use?

[Smokealotapotamus]

im only growing 2 plants at the moment, but temps get as high as 87 degrees sumtimes..