SIMPLE TO OPERATE HANG-ON-BACK SKIMMER The Classic 100-HOB is a proverbial favorite amongst hang-on back skimmer users capable of filtering aquariums up to 105 gallons. The Classic 100-HOB features an easy to install and operate design in which the pump is mounted inside the aquarium. To install, simply place the skimmer on the back of the aquarium, mount the pump in place, adjust the intake strainer and it is ready to skim. The Reef Octopus Classic 1000-HOB is constructed of high-quality acrylic and equipped with the new highly efficient Aquatrance pinwheel pump that produces an ideal mix of water and air for optimal waste removal. Rated for aquariums up to 105 Gallons Footprint: 8" x 3.75" | Height: 17" Powered by: Ultra-efficient Aquatrance 1000s pump Features Now with adjustable surface skimmer attachment - Low Profile body - Air Silencer - Solid Construction Filtration Handling - 105 gallon – Light Filtration Demand - 80 gallon – Medium Filtration Demand - 60 gallon – Heavy Filtration Demand Technical Specs - Footprint: 8" x 3.25" - Total Height: 17" Aquatrance 1000s Pinwheel Pump - Wattage: 9w - Air Draw: 420 lph / 15 SCFH* - Water Draw: 350 lph / 92 GPH* *Air and water results will vary depending on aquarium setup Warranty 2 year manufacturer's warranty on pump and 1 year on skimmer body