anyone using co2 in there grow tent? need help

[oldmac]

Hello and welcome mferreyra420,

You should maintain, during the photoperiod, 1,200-1,500 PPM of CO2.

1,500 is pretty much optium, but controllers usually have a turn on / turn off range....hence the 1200-1500 ppm.

Good luck and good growing.
OM