I like Tunze better hate that they are bulky but I love the flow and controlablity from them. I have 3 in my 240 and I have alot of flow I can make waves just as easy with or with out a wave box with my 6100.
Turbelle® stream 6105
•For aquariums from 200 to 2,000 litres (52 to 528 USgal.).
•Flow rate: 3,000 to 13,000 l/h (792 to 3,434 USgal./h).
•Energy consumption: max. 45 W.
•Voltage / frequency: 100 – 240 V / 50 – 60 Hz.
•Cable length: 5 m (196.8 in.).
•Dimensions: diam. 90 mm (3.5 in.), Outlet: diam. 50 mm (1.96 in.).
•Magnet Holder up to a glass thickness of 19 mm (.74 in.).
vortech
The VorTech uses the most advanced motor technology available, allowing the water flow rate to be completely controllable. Operating on tanks between 20 and 500 gallons and producing between 100 and 3,000 gallons per hour of flow, the VorTech is the most versatile flow product on the market. The VorTech is designed to operate on gap thickness from 1/8" to 3/4".