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You don't use an air pump with a co2 injected planted tank. Atleast not while the lights are on. Some people turn on a air pump at night to make sure they get enough oxygen in the water. I don't and don't have any problems but some do.
That's basically correct, but just let Your fish tell You. If they head to the top at lights out or by morning--then you probably need more 02. Sometimes adjusting for slightly more surface turbulation will provide all you need without wasting excess C02.

HTH
 

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The air stone will remove a lot of CO2 if you do that, would be a waste.

Like mention above, some people turn on the air stone when the lights and co2 are off. This oxygen also needed by plants to complete its respiration as it need oxygen during night time.
 
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