The Aquarium Systems SeaClone 100 protein skimmer can function as either an external hang-on or internal sump skimmer and comes complete with a Maxi-Jet pump. The tornado-like motion inside the SeaClone 100 protein skimmer removes organic wastes from your aquarium. The SeaClone 100 protein skimmer has been developed and tested in different aquarium environments. As a result, its design is simple and user-friendly. The SeaClone 100 protein skimmer requires no airstones and is more efficient than air-driven protein skimmers. The SeaClone 100 is for saltwater aquariums up to 100 gallons.