Martin D
Seedling
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Agreed, either you just do to little CO2, or metering is wrong. \I asked for a pH profile because i (and a lot of others here) believe it's the best way to see wether you are injecting enough CO2. Just take a measurement every hour. You should see a good drop (depending on your GH) of 05, 1 or even 2 full points (at low GH) which tells you you are getting plenty CO2 in the tank. DON'T worry abourt the pH drop, this will never harm your fish, because it's a "weak acid"reaction.So why do you think that the injected C02 does not drop the PH?