Reef Octopus Regal 250-INT In-sump Protein Skimmer For aquariums up to 600 gallons with a light filtration demand. For aquariums up to 500 gallons with a medium filtration demand. For aquariums up to 300 gallons with a high filtration demand Footprint: 16 Reef Octopus 36V VarioS-6S Controllable Pinwheel Pump. 5 controllable energy saving power settings. Output Size: 50mm - Comes with metric to British adapter to 1.5 pvc Recommended Sump Water Depth: 7