Indoor Co2 question

[Steamer]

Hello all. Just wondering on everyone's co2 systems or lack there of for autos. This is my first indoor grow usings autos and I am not growing stealth. Have good air circulation and temps are 75 air 70 reservoir. Area is approx 3'x3' with 4 plant locations and I am using a drip dwc hydro system. Current lighting is 2 cfl 25w and 2 led bulbs (ones similar from the caligrowkit led system) will be adding 150 hps when it arrives. With this setup would a co2 system be critical for my grow or just an added bonus? What kind of inexpensive co2 methods do most use?

 

[HomieHogleg]

I don't see where CO2 would help as much as better lighting. I keep my fermenters for my homebrew, in the room my flowering tent takes air from. Don't know if it really helps, but I figured that it can't hurt.

HomieHogleg