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This is my experience. I have a pH controller and I can accurately regulate the CO2 levels in my tank. I can say that in my aquarium, levels of CO2 above 15 ppm have negative effects on some of my aquarium fish.
15 ppm is dark green to blue green on a drop checker so this is lower than many people keep their tanks.
OK probably no one here knows the CO2 level of their tanks but what color do you think your drop checker should be at? I know that a number of people think that when their drop checker goes yellow their fish are at risk. I think that when your drop checker goes green, your fish are not happy.
Where is your drop checker?
15 ppm is dark green to blue green on a drop checker so this is lower than many people keep their tanks.
OK probably no one here knows the CO2 level of their tanks but what color do you think your drop checker should be at? I know that a number of people think that when their drop checker goes yellow their fish are at risk. I think that when your drop checker goes green, your fish are not happy.
Where is your drop checker?