German-made Tunze powerheads are one of the best high-flow powerheads available. They are smaller and can be hidden in the aquarium easier than competing brands. Tunze pumps can be configured in a wide range of positions to target any area of the tank. Tunze Turbelle Nanostream 6020 -For aquariums from 10-66 gallons -Flow rate: 660 GPH -Manual Flow Adjuster -Energy consumption: 4W -Energy consumption as tested: 4.6W -Cable length: 78.7" -Output diameter: 1.57"