newgroweroldsmoker, what i have done, since the baking soda vinegar thing doesn't last long in releasing co2, then i only use a little at a time. usually a heaping teaspoon and enough vingar to get all of the soda. i tend to put it next to the plant where the airflow will go to it and i do it whenever i think of it since you cannot overdo the co2 with this method. sometimes i'll put a scented candle in a coffee can and burn it also as that releases co2.

however, i've just learned a couple things. you are past the first week in flowering. if you give them co2 in flowering, it will help the plant grow faster of course and the buds will form faster, however, there are some thoughts that a good amount of co2 during flowering can lower your potency. so i play the middle ground and give them plant co2 sparingly but not as much as i do in veg. state. hope this little cheap idea helps you in your growing. take care