If u really want to use that crap then do it in flowering(when you actually see the flowers!). The size of grow area you stated is too small for 10 plants. Ethier reduce plants or flower early or the plants will get too bushy which means less light penetration which leads to less yield and you just wasted veg nutes LOL! Keep note to plan ahead when space is limited.
If you want to use co2, go hard or go home. I've tried fermentation on two 55 gallon drums, dry ice, boosters but nothing compares to using tanks or generator. Tanks and generator are the ones that can actually pump enough co2 for the plants because they eat alot and even more when they get bigger. Invest on a bigger area/tent.