automatic siphon pump (semi-automatic water exchanger), convenient Aquarium Siphon Vacuum Cleaner For Fish Tanks,Fish Tanks Cleaner,Water Exchanger,Aquarium Siphon Water Changer,Fishtank water changer, fish tanks toilet suction, sand washing water changer, cleaning suction pipe, siphon pipe, cleaning water pipe,suitable for fish tanks too highly to difficult cleaning, the distribution of feces scattered, difficult to cleaning the dead corner of the fish tanks The airbags isthickened and enlarged, strong suction, and the water change speed are increased Equipped with waterflows control valves, the waterflows can be adjusted. remove dirt from the bottom of the aquarium. Equipped with long straw, suitable for large and small aquariums