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Octo Classic Hang-On Back Protein Skimmers are a favourite. With its unique design the pump is mounted externally and under the actual skimmer body allowing for much less room needed behind the aquarium and less heat to water exchange. Enhanced performance; Easy to assemble and maintain; 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. Suitable for Tank Volume: 300-500L