Review on Pawfly 4 Inch Air Stone Disc Bubble Diffuser: Enhance Your Aquarium with Suction Cups! by Dana Jones

Over time (3-4 months) the bubbles got smaller, but that doesn't bother me at all (there's still a chance the bubbles will look "thicker". because the stone is covered Pros: - large size creating a nice round column of air in the center of the tank - never detached from the bottom of the tank when I attached it with suction cups - can be carefully buried under debris - that is a fraction of the price you would normally find for accessories in pet stores Cons: - not yet