PROBLEM TO BE SOLVED: To provide a water quality controlling apparatus of a water tank for aquarium fishes which makes the maintenance of the water tank easy and achieves the reduction of running cost.SOLUTION: The water-quality controlling apparatus 13 arranged in a part of the bottom of a water tank 11 for aquarium fishes is equipped with a case 14 composed of an insulated material having many openings with such size not allowing entry of fishes and an electrode group 15 arranged in the inside of the case, in which anode electrode plates 15a having many openings and cathode electrode plates 15b having many openings are arranged so as to be alternately faced, and a means for supplying direct current power to these anode electrode plates 15a and these cathode electrode plates 15b.COPYRIGHT: (C)2009,JPO&INPIT【課題】観賞魚用水槽のメンテナンスの簡易化及びランニングコストの低下を実現する観賞魚用水槽の水質制御装置を提供する。【解決手段】観賞魚用水槽11の底部の一部分に配置する水質制御装置13であって、魚が入り込まない大きさの多数の開口を有する絶縁材料からなるケース14と、前記ケースの内部に配置され、多数の開口を有する陽極電極板15aと多数の開口を有する陰極電極板15bとが交互に相対面するように配列された電極群15と、陽極電極板と陰極電極板とに直流電力を供給する手段を備えた。【選択図】図1
