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I think the limiting factor on the 160 is the 90 degree eblow that the pump output empties into under the bubble plate.
As far as the 160 is concerned I have no idea why anyone thinks it needs more air than it's currently getting. @ ~30 SCFH I have the water level adjustment completely removed (as low as it will go) and the bubbles are breaking at a good level. Any more air and it would simply overflow IMO.
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