Photo 1 of 12-Pack Large Air Stones, Humongous 4 x 2 Inch Round Filter Aerator Stones for Aquarium, Hydroponics, Fish Tank, Koi Pond, Cylinder Bubble Aerator Diffuser for Pump, Growing System

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Photo 1 of 12-Pack Large Air Stones, Humongous 4 x 2 Inch Round Filter Aerator Stones for Aquarium, Hydroponics, Fish Tank, Koi Pond, Cylinder Bubble Aerator Diffuser for Pump, Growing SystemPhoto 2 of 12-Pack Large Air Stones, Humongous 4 x 2 Inch Round Filter Aerator Stones for Aquarium, Hydroponics, Fish Tank, Koi Pond, Cylinder Bubble Aerator Diffuser for Pump, Growing System