Ive researched abit more and i think im going to use canna’s full on organic soil which is known as canna bio, instead of canna terra. Also i was thinking, do you think it would be worth using a co2 bag for a 5 x 5 tent ? Would it help much ?
With air exchange no is the short answer.
Where is the tent located? If in a basement room then it possibly could. But only if the co2 can be built up in the room that the tent is in.
You also need the lights to take advantage of it.
And understand co2 is % based increase to growth (about the best way I can think of to put it) basically the faster the growth you see before adding the more of an impact it will have. It doesn't take slow growth and make it explode.
So I'm short in soil you will see less benefits in terms of gains in growth speed than say aeroponics, hydroponics or soilless.
In addition it will proportionally increase the demand of nutrients with the % of growth rate increased and yet reduce the transpiration (uptake of water and nutrients) because of the increased efficiency of photosynthesis, actuallymaking it more water efficient. So this means you have to plan how your going to get more nutrients to the plant. I prefer an increase to the VPD and slight increase to the concentration of nutrients. Some will run the same VPD and higher ppm (some running in the range of 1600-2000) depending on many variables.
With organics I can see it being a bit of a challenge to manage the demand so possibly a higher VPD and teas would be the easiest way to address this. Although in soil you will not see as significant of benefits imo as other grow styles.
You also don't wanna bother wasting co2 on small plants as like I said it's benefits are seen on a % bases of photosynthesis. A plant with 10-20 leaves vs a plant with 100-200 have extremely different total over photosynthetic rates.
To make an example with made up units.
20 leaves produce 20 units of energy. Co2 can improve this by say 20% so you have a net gain of 4 units a day for total of 24.
200 leaves produce 200units and a 20% increase would be a net gain of 40 units... so 240 total units of energy.
Hope that makes sense