Size Name:40 x 50mm Airstones Water rich in oxygen is essential for happy, healthy fish and plants in your pond or aquarium. Furthermore, combined with the right pump, the generated air bubbles can act as an impressive display feature. Air stones require an air pump and airline to get the air to them, these are both available separately in our store. Classica ball airstones Can either be hidden beneath the gravel or sit on top. These airstones simply Connect to standard size airline.
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