Are you injecting co2? If not then why would you be worried about oxygen at night? Understand that air pumps are only for surface agitation, which I'm sure your filter already provides.
That being said, if you are not injecting co2, it won't HURT anything, it just isn't helping.
Of course, maybe you like the look of a tower of bubbles. I'm sure some people appreciate that particular effect.
But what are the tank specs?
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