Reef Octopus OCTO Classic 110-S In-Sump Protein Skimmer supplies powerful filtration for aquariums up to 100 gallons where sump space may be limited. The Reef Octopus OCTO Classic 110-S is constructed of high-quality acrylic that can be completely disassembled for cleaning. The new Aquatrance pinwheel skimmer pump produces an ideal mix of water and air for optimum waste removal. Easy of control with its vented wedge valve output for precision control and quiet operation. Latest output design allows cleaned water to exit the skimmer below water for quiet operation.