You will be fine with out the air stone.
A popular misconception is that air stones actually put oxygen into the water. Oxygen is absorbed into the water from the surface. The surface agitation from an air stone helps with the oxygen exchange by moving the surface of the water and clearing oils and other surface crap so the oxygen can be absorbed. Same effect will happen from your power filters if you point the returns towards the surface.
Another tip: Cooler water holds more dissolved gas like oxygen.
A popular misconception is that air stones actually put oxygen into the water. Oxygen is absorbed into the water from the surface. The surface agitation from an air stone helps with the oxygen exchange by moving the surface of the water and clearing oils and other surface crap so the oxygen can be absorbed. Same effect will happen from your power filters if you point the returns towards the surface.
Another tip: Cooler water holds more dissolved gas like oxygen.
