PROBLEM TO BE SOLVED: To provide a water purifying device used for an ornamental fish tank, which is easily assembled as both a bottom-mounted type and a water tank outside-hanging type and does not spoil the appearance. SOLUTION: The filtering part is divided into a plurality of filtering blocks 2A, 2B which can be connected to each other both in terms of external shape and in a water channel and are covered with a cover, and can be rearranged as an aquarium external hanging type or a bottom type. It is configured to be possible. [Selection diagram] Figure 1【課題】下置きタイプ、水槽外掛けタイプのいずれのタイプとしても簡単に組み立てられ、美観も損ねない、観賞魚水槽に用いられる浄水装置を提供する。【解決手段】濾過部を、外形的にも水路的にも互いに連結可能で、カバーで覆われた複数の濾過ブロック２Ａ、２Ｂに分割して、水槽外掛けタイプとしても下置きタイプとしても組み替えることが可能となるように構成する。【選択図】図１
