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
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