AQUARIUM-INFOTEXT-DATA Kind CO2 Inhalator Usage Turn on to introduce some CO2 into aquarium, this can help to mantain a certain Ph in different water hardness condition. Use settings to define how much CO2 introduce. Notes On Object Differently from O2 Inhalator this is not the amount of CO2 produced per iteration but simply a reference, so that if not enough CO2 is present new will be introduced to raise concetration. During non light hours CO2 Inhalator is doesn't work even if still on because usually vegetals provide enough CO2 to keep concentration high enough for the current Ph.