The Vortech Propeller pump is the gold standard for generating flow in reef tanks, and is unsurpassed in beauty and functionality.
Flow: 4,500+ gph (17,000+ lph)
Power Consumption: 9-38 Watts
Tank Range: 50-500+ gal (190-1,800 liters)
Max Glass Thickness: 0.75 inches (19 mm)
Reef Crest Mode
Short Pulse Mode
Tidal Swell Mode
Nutrient Transport Mode
Plus... Feed Mode, Night Mode, Wave Auto-Tune
More details here: http://ecotechmarine.com/products/vortech
This is the pump I use on all my aquariums, and the main benefit for the reef is that each one is plugged into a Battery Backup by Ecotech. This battery keeps the pumps running for as long as 24 hours. Maintaining flow in your aquarium during a power outage is the difference between life and death of livestock. That's why I trust Vortech pumps. They run silently, take up no space in my aquarium, and keep the cords out of sight.