First Grow, have a few questions....

Currently putting together my first ever grow and it will be indoors. I had a few questions and what better place to ask than here...

Will be using a Secret Jardin DR120 with a 240W Full Spectrum G8 LED. Having to use tap water but will balance out the PH since it's very acidic here. Purchased Dyna-Gro organic nutrients to supplement in between feedings. I live in a newer condo and do have neighbors. I would like some input on ventilation/fans and smell. The closet has 6" ventilation and exhaust ports but where and what do I put in them? I feel it will be easier to pull air than to push it. Since the LED's won't produce much of any heat or noise, what's an affordable setup to get me growing?

One last thing, I have a 20lb CO2 that is full with a regulator attached that was taken from an old kegerator that went out. What is the easiest way to properly introduce adequate CO2 levels for growth?

Cheers

I am not familiar with CO2 but as far as exhaust goes. You can go get a 4" inline fan with carbon filter. Filter in tent attached or ducted to fan so you are pulling air through filter and ducted out of tent. I like DG nutes. Your ok with tap water if doing soil grow check ph and ecc/ppm if possible. Let water sit over night. You may need to add additional supplemental light to that LED.