Pawfly Nano Bubble Air Stone Disc

Tiny bubbles, not medium ones, come off this disc: a fine haze that rises slowly through the water. The 1.4 inch disc (model Y35) passes 2 L/min, around 32 GPH, on a pump above 2 W with standard 3/16-inch tubing. A two-way control valve comes in the kit, so you set bubble strength at the line instead of at the pump.

Choose 1.4 inches for a nano tank or a glass bucket, 2.4 inches for a larger footprint. Bring your own pump, because none comes with the kit. If only a few bubbles appear after you connect it, switch the pump off for about 5 seconds and back on. Once a month, soak the disc, brush it lightly and let it dry in a cool, airy place.