Powerful Needle Wheel Design — Efficient internal needle wheel impeller increases air-water contact for maximum waste removal and clear saltwater. Compact Hang-On Design — Space-saving body easily mounts on aquarium edge, ideal for tanks without sump or limited cabinet space. Quiet and Energy Efficient — 7.8W Red Devil SP1 pump provides strong yet silent operation with low power consumption. Durable and Easy to Maintain — High-quality acrylic body ensures long-term reliability and simple cleaning with easy disassembly. For 15–40 Gallon Tanks — Suitable for marine, reef, or nano coral tanks, effectively maintains water clarity and healthy aquatic environment. Product specification: Item No.: RDC- 150 Skimmer type: Internal Hang on type Size(Diameter / Height): 60/415 mm Pump:Red Devil SP1 Power:7.8W Air intake: Max 180L/H Max. size of the tank (L): 40 Gallon Recommended tank size: 15-40 Gallon Footprint (MM): 150/90 mm not include the bracket 150/ 110 mm with bracket working for nano tank, air intake can be adjustable