Running more in room air won't do anything for ph.That air pump is only $40!
My tank sits in a garage and I am tempted to buy the pump just to see if I can force the pH up by running air? The pump specs indicate that it pumps -1000gph air, and I do wonder if it should be liters per hour of air(?) but either way that’s going to make a lot of bubbles and possibly salt creep in the sump but the volume exchange and displacement of CO2 from the bubbles seems more likely than running a tiny air exchange setup.
The air needs to come from outside to have any effect.
I run 2 Tunze 9430dc skimmers on my 150g system. Adding a second does nothing for ph.

