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

The stone arrived quickly. The price was good! I soaked the stone for over an hour as suggested. I have an air pump that goes with the stone so I didn't think there would be any problems. When I connected the stone there were no bubbles. I left it plugged in all night hoping it would start working, but this gem just doesn't work. It's sad because it's silent, the price is good, the delivery is fast. The stone simply does not create bubbles.