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Old 07-25-2018, 04:19 PM   #29 (permalink)
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Default Re: Passive CO2 diffuser

Keep in mind that gases are diffusing BOTH WAYS at the interface: CO2 from your diffuser gas to the aquarium, and N2 and O2 from aquarium to diffuser gas (assuming the diffuser gas is lower in those components). This is similar to how diving beetles and spiders use an air bubble as a "lung" to extract oxygen out of the surrounding water. The change in gas volume is not really a good measure of how much CO2 has dissolved.
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