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DIY O2/CO2 reactor?

I'm going to build a CO2 reactor soon, using a powerhead pumping water into a
old gravel-vac tube, and injecting the CO2 into the gravel-vac tube.   I'm
wondering if there would be any benefit or drawback to also pumping air into
the reactor tube.  It seems to me this would ensure very high concentration of
oxygen, along with the CO2.

Any downside that I'm not seeing right now?