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Having an aeration system is not a bad idea - as mentioned, O2 and CO2 can "exchange" at the water's surface only .. which is not very large depending on the dimensions of your aquarium.
The best option is to use real plants .. i've been running an aquarium for the last 8 years with live plants (the same ones!!) and have never needed an aeration system [tall tank w/ small air/water surface area]. The plant I love the most is the amazon sword (large leaves).
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