Dont do this mickey mouse shit, not if youre wanting to actually provide Co2 and why would you need an air stone? you wouldnt supplement the nute solution, youd want the co2 to fall onto the leaves. Furthermore, You need a completely sealed environment if you want to use co2 without wasting it, this means air cooled reflectors, or cool tubes, and more than likely an air conditioner.
and yes, youll need a co2 regulator and tank, Id also reccomend getting something like one of the C.A.P controllers that will turn your fan off when youre co2 is being supplemented.
Hope this helps.