I use several extra large ice chests. For diffusers I use weep hose. Hook to oxygen. Set regulator to put out a steady flow of bubbles. Too much oxygen is not good. I run the weep hose around the inside perimeter of the ice chest. I silicone short pieces of pvc pipe inside the ice chest to run the weep hose thru to hold the hose in place. Be sure to drill a couple of holes in top of ice chest. I put the holes where the drink holders are.
Not hard to set up and works great.
