10-16-2008, 12:15 AM
Join Date: Apr 2007
Location: Boston, Ma
iTrader Positive Rating: 97%
| | Re: CO2 at night with PH controler
assuming you have your co2 set to your ph controller set your ph controller on a timer so that it turns off the co2 supply when your lights go off. plants don't need co2 at night. O2 is a plus however!