Co2 Question

I also brew my own beer at home. I do this by fermentation. So I have five gallons of a barley malt cocktail fermenting in a five gallon bucket with yeast. The bucket is airtight but as a C02 release in the top it won't explode. My question is about how much Co2 do you think this it, I am going to put my five gallon fermenter in my grow tent to get that extra CO2. My tent is 6x6x8. What do you think?

I think its a great idea....in fact I know people who do that....it'll work well