coz tank question

i hace a couple plants that are ready fir flowering. im sectioning my rooom off to make a small flowring roomit will b about 3x4 feet and im flowering i g13 and amonster bubblegum how big of a co2tank should i get? and what whattage hps can i get away within there. keeping in mind i will put 4-6 in there later. thanks guys i appreciate any help

600 HPS and 20 pound, just what I would use....

What he said.

You could do a 1000w in there if you wanted to get crazy. 600w will do. a 20lb tank will definitely do you. Should last a couple months in that size room as long as it's sealed.