The utility model relates to a cleaning device at the bottom of an aquarium.The utility model relates to a collecting and guiding base covered with a filter cover.It is divided into a wide area, and the feces and impurities of the fish can be deposited on the inclined surface.The diversion area of the lower diversion area,And a relatively narrow and closed pumping area.And make up,Each of the lower guide area and the pumping area is provided with a connecting port.And one side of the pumping area is provided with a pump to pump water into the water.The inflow head in the lower diversion area,And a pumping head through which water in the pumping area can be pumped away；Therefore, it is sent up through the water head.The impact of the water column in the lower diversion zone,The fish's feces and impurities are disturbed and pass through the connecting port along the return water flow.In the pumping area, it is sucked away by the pumping head and filtered.And then make the filtered water return to the inlet head and circulate continuously.So let it sink.Feces and impurities of fish in the lower diversion zone,It will not accumulate and be filtered.The water quality at the bottom of the aquarium can be kept good and stable.Thus, the overall water quality in the aquarium will not be affected.一種水族箱底部的清淨裝置，是一其上方覆蓋濾物蓋之集收導流底座內，被分隔成一面積較廣而可供魚之排泄物與雜質沈澱入之具有傾斜狀之上、下導流區的導流區，以及一面積較狹窄而呈封閉狀的抽水區，並令上、下導區與抽水區之間各設有連通口，且在抽水區內的一側設一可透過抽水泵將水打入上、下導流區內的入水頭，以及一可透過該抽水泵將抽水區內之水抽離的抽水頭；故透過入水頭送入上、下導流區內之水柱的沖激，而擾動其內魚之排泄物與雜質順著回流水流通過連通口，進入抽水區內被抽水頭吸離而過濾，再使過濾後的水回至入水頭而不斷的循環，因此讓沈澱入上、下導流區的魚之排泄物與雜質，不會累積並受過濾，令水族箱底部水質可以保持良好與穩定，進而不會影響水族箱內整體水質。
