Drawing air into tank with skimmer

Err..What? :spin2:
Your skimmer is already drawing air into itself via its venturi which in turn is adding "air into your talk"
 
If you are talking air from outside you run a line from the venturi to wherever you plan to draw it from.
A caveat: be careful of possible pollution from things like pesticides or air pollution.
 
what is your reason for drawing in outside air? Low PH is my guess? If so, you might want to consider a CO2 scrubber.
 
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