The Aqua One AquaBac is a low profile internal filter for freshwater aquariums and provides a combination of biological, mechanical and chemical filtration.With a large filter volume in an easy to place, narrow body, the filter is excellent for small to medium aquariums.Features & Benefits:Fully submersibleQuiet operationIncreases oxygen content of the tankSuction cups provided to securely fix the unit to the side of the aquariumMounting bracket includedFilter media includedSlimline design d..