Aquarium Siphon Syphon Auto Fish Tank Vacuum Gravel Water Filter Cleaner Pump Easy to install and use. Remove the dirty things from the bottom of your aquarium effectively. Support two suction pipe sizes, suitable for both small and large aquariums. Also can be used as a water siphon for changing water, or to empty your aquarium when you connect a hose to outlet. Adjustable height. Hose & Filter bag are included.