The Reef Octopus Regal 150-INT Protein Skimmer is rated for aquariums up to 211 gallons and built around a hybrid conical body that concentrates rising foam more efficiently than a straight cone shape. It's powered by the Reef Octopus VarioS-2S variable-speed DC pinwheel pump, giving you push-button control over air and water flow instead of a single fixed output. Capacity: up to 211 gallons, no sump-space restriction Pump: VarioS-2S variable-speed pinwheel pump, 24V Body: solid cast acrylic, hybrid conical shape, fully disassembles for cleaning Recommended sump water height: 7-8.7 inches The Regal line sits alongside the Elite Series as Reef Octopus's DC-controlled skimmers, with the hybrid conical body giving it a distinct look and foam-handling profile from the Elite's Super Cone design.Compatible replacement parts: VarioS-2S pump kits sized for the Regal 150 series.