The included water pump in this 2-gallon desktop fish tank kit has several advantages. Firstly, it has an oxygen-increasing function, which ensures that the water in the tank stays fresh and healthy for the fish. This helps promote the overall well-being of the fish and promotes their growth. Secondly, the air intake of the water pump is adjustable, allowing you to regulate the flow of air into the tank to achieve optimal aeration levels. Thirdly, the pump also features an adjustable outlet nozzle that can be moved up and down, which allows you to direct the flow of water as desired. Lastly, the pump is very quiet, so it wont disrupt the peaceful environment of your home or office. With these features, this water pump provides an efficient and effective way to keep the water clean and healthy for your fish, making it an excellent addition to this fish tank kit.