A water aerating and dirt collecting device for an aquarium includes a pumping device having a paddle device for pumping and circulating the water contained within the aquarium, a receptacle having an entrance coupled to the pumping device for receiving the water from the pumping device and for agitating the water and for generating an eddy current, and a casing having an inlet port coupled to the receptacle for receiving a filtered dirt from the receptacle and having a mouth coupled to the pumping device for allowing an air in the casing to be drawn into the pumping device. The receptacle includes a tubular member for collecting the filtered dirt.