Aug 9, 2013 #1 Mijo51380 Aquarium Advice Freak Joined Jul 11, 2013 Messages 268 How long should I leave the co2 in
Aug 11, 2013 #3 Mebbid Aquarium Advice Addict Joined Mar 1, 2013 Messages 12,626 Location Michigan USA Turn it on 1 hour before lights on and turn it off at lights out.