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Old 01/14/2017, 07:41 PM   #8
karimwassef
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Join Date: May 2004
Location: Dallas, TX
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my understanding is that the gas levels in the water are in equilibrium with the levels in the air. This is especially true if you have a skimmer or another source of air injection, but the large surface area of the tank water works well too.

Any CO2 consumed by the algae is replaced from the air through the water to maintain equilibrium. In fact, most indoor tanks have a lower pH (~7.8) because of the naturally higher CO2 levels in air increasing carbonic acid (dissolved CO2).

Unless you have more algae than other CO2 sources (respiration, etc...), you have a continuous source.


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