What is this based on? I can't recall seeing anything that backs it up.It is more difficult to dissolve CO2 in hard water.
Drop checkers are not accurate enough to tell us that we have the "right amount" of CO2 in the water. They just tell us that we have a significant amount of CO2 in the water - more than a few ppm, and they can suggest that we may have too much CO2 in the water. Once you get experienced with your tank and your CO2 system you don't need a drop checker at all. You can tell if you have the "right amount" of CO2 in the water by watching the inhabitants of the tank, both plants and fish.Hi i bought a Advance Plus Complete Aquarium CO2 System from co2 art my tank is 180l i thought the drop checker being green means its the right amount of co2 my bps must be about 2-3 a second i have the diffusser under the spray bar and the drop checker to the side of the tank https://www.dropbox.com/s/vdbsgb8ss8umkmf/DSC_0139.JPG?dl=0