AquaMaxx HOB (Hang-on-Back) Series protein skimmers feature incredibly responsive collection cups and amazingly powerful submersible pumps. They are rated for aquariums from 50 to 100 gallons with a design thin and light enough to be placed on a nano or other small saltwater tank. AquaMaxx HOB Series protein skimmers remove organic waste from aquarium water. They create a strong mix of small air bubbles and turbulent water movement to force protein, waste and other materials into a collection cup for easy removal. AquaMaxx skimmers are computer-precision engineered and utilize the latest filtration technology to deliver the performance and value you are looking for in a protein skimmer.