American Aquarium Products review demo the aquarium Fusion Air Quite Pump. Including the Fusion 300 air pump, Fusion 600 Air Pump and the Fusion 700 Air Pump. These pump are the most quite air pump and could help how to make aquarium air pump air pump quieter.
Using a 4 inch airstone and new airline tubing.
The 300 has a single port and the 600 & 700 have dual ports with variable air control.
Possible the best aquarium air pump.
Resource for Fusion Quite Air Pumps: