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
oldmac Reviewed by oldmac on . anyone using co2 in there grow tent? need help my tents 150 sq ft and im using 2 air cooled HPS with a 48w LED, and im using deepwater culture and fogponics to feed the ladies.anyone know how much ppm i should keep my tent at? Rating: 5