2 X 530 Gph- Aquarium Wave Maker Reef Fish Tank Powerhead Circulation Pump with Magnetic Mount Totally submersible and oil-free motor. Total flow rate: 530 GPH (2000L/H) 360 degree rotation to adjust flow in any direction. Magnetic mounting system with articulating ball joints for versatile directions, Magnet is specially covered to prevent corrosion Revitalized your aquarium and to eliminate dead spots. No more debris settling on the bottom or in the corners of the tank. No other side effects to the fishes, the corals and other aquatics. Includes: 2 pieces of 530 GPH Wave Maker, Recommend aquarium size:26-53 gallons