PURPOSE:To efficiently supply oxygen by a compact device and to reduce trouble, vibration and noise by laying a small-sized aeration tank in a recycling path of water of living fish tank and feeding oxygen. CONSTITUTION:A diffusion pump 19 comprising recycling water of a living fish tank 1, from which harmful substances are removed by filters 2a, 2b and 2c set in a recycling path of the living fish tank 1 and by an aeration tank 4, as drive fluid is laid in an aeration tank 6 equipped in the recycling path. The recycling water is passed through an air introduction chamber 20 of the diffusion pump 19 at high velocity and fed together with air into the aeration tank 6 to supply oxygen to the recycling water of the living fish tank 1.
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