PROBLEM TO BE SOLVED: To provide a water quality purification agent for aquarium fish capable of purifying breeding water in a water tank for aquarium fish, and keeping it clean over an extremely long term.SOLUTION: Concerning a water quality purification agent for aquarium fish containing 100 pts. mass in total of 10-30 pts. mass chaff ash zeolite and 90-70 pts. mass chaff charcoal, preferably, an average particle diameter of the chaff ash zeolite is 5-100 μm, and its specific surface area is 50-500 m2/g. The water quality purification agent is included in a bag-like material comprising a porous nonwoven fabric, and used.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】著しく長期間に亘って、観賞魚用水槽中の飼育水を浄化して清澄に保持し得る観賞魚用水質浄化剤を提供する。【解決手段】籾殻灰ゼオライト１０～３０質量部と籾殻燻炭９０～７０質量部との合計１００質量部を含む、観賞魚用水質浄化剤に関し、好ましくは、上記籾殻灰ゼオライトの平均粒径が、５～１００μｍであり、かつ、その比表面積が、５０～５００ｍ２／ｇである。該観賞魚用水質浄化剤は、好ましくは、多孔質の不織布から成る袋状物に内包されて使用される。【選択図】図１
