An object of the present invention is to provide an aquarium water treatment device with high water quality improvement effect by the permanent magnet. The apparatus includes a plurality of permanent magnets 4, a frame 3 which holds the permanent magnet 4, a case 2 which encloses a frame 3 provided with, in aquarium water treatment apparatus used to put in a water bath of aquatic organisms such as fish In a, the frame 3 is held in substantially are opposed with a gap 42 with the permanent magnet 4, the case 2 includes a lower opening 21 which is located below the permanent magnet 4, an upper opening which is located above the permanent magnet 4 It has 20 and, to the frame 3 or the case 2, is provided with the holding portion 32c for holding by the tip tube 93 for supplying air is positioned below the permanent magnet 4 into the tank. .BACKGROUND 2【課題】永久磁石による水質改善効果の高い水槽用水処理装置を提供する。【解決手段】複数の永久磁石4と、永久磁石4を保持するフレーム3と、フレーム3を内包するケース2と、を備え、魚類などの水生生物の水槽に入れて用いられる水槽用水処理装置であって、フレーム3は、永久磁石4を隙間42をもって実質的に対向させて保持し、ケース2は、永久磁石4の下方に位置する下部開口21と、永久磁石4の上方に位置する上部開口20と、を有し、フレーム3又はケース2に、水槽内に空気を供給するチューブ93をその先端を永久磁石4の下方に位置させて保持する保持部32cを設けた。【選択図】図2
