I thought that the tunze produced a wide flow pattern.
"Since the introduction of the Turbelle® stream pump, the realisation of currents in reef aquariums has changed. The pumps have been developed especially for water circulation in aquariums and set an absolute record in the field of aquarium pumps with 30,000 l/h (7,925 USgal./h) and an energy consumption of only 64 Watt.
Commercially available aquarium pumps produce an excessively high flow rate in the core area of the water jet and a much too low flow in the marginal areas. These differences will lead to stress on the aquarium inhabitants, in particular on coral polyps. Whereas it is desirable to generate gentle parallel flow lines in the aquarium with lower flow rates and without a hard water jet. Like in nature and to the benefit of the animals, Turbelle® stream pumps meet these requirements.
The electronically controllable models have been fitted with a FishCare function when the motor is at a standstill." This is from Tunze Websire.
