Penn Plax AS6Q 4-Pack Aqua Mist Air Stone Cylinder Aerator for Fish Tank 075269018141 the boots form a vacuum

the boots form a vacuum bubble at the end of the glass unless tilted properly

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Penn Plax AS6Q 4-Pack Aqua Mist Air Stone Cylinder Aerator for Fish Tank 075269018141 the boots form a vacuumAqua Mist Air Stone is a green colored aerator when added to an aquarium it produces a better supply for oxygen for you fish. Features a pack of four fine mist aqua aerators. The Aqua Mist Air Stone Cylinder is a fine mist aerator that alows more oxygen in the tank and enables your fish to breath better. It comes in a 4 pack and each Air Stone measures 7 16". Brand: Penn Plax, Model: AS6Q, Size: 7 16" Single 4 pack