The Syncra Silent line of pumps come in many different sizes and will fit most tank needs.  Sicce uses high quality magnets in their pumps, which allows them to spin smoother with less noise than almost all other pumps in their price category.  If your tank needs a high flow return pump, or a smaller pump for a low flow reactor our first choice will always be Sicce.
 
Quiet, energy-efficient pump for a variety of uses in wet or dry application. Use in salt or freshwater.
 
Features:
5 Year Motor Warranty with online registration
Synchronous motor and advanced rotor result in 100% silent operation
Adjustable flow rate
Ceramic shaft and bearings
Durable rotor and shaft
Applications: saltwater aquariums, protein skimmers, indoor fountains
Submersible or in-line use
2.82psi
 
Specifications
Output: 568 GPH
Maximum Head Height: 6.5 Ft
Power Consumption: 35W
Inlet: 3/4" Female NPT or 3/4"-1" Hose
Outlet: 3/4" Female NPT or 3/4"-1" Hose
Dimensions: 4.84" x 3.35" x 4.13"
Cord Length: 6 ft
Warranty: 5yr (motor)/6 month (impeller)