Have the Tunze in my 1000 liters aquarium (= 2,50 meters long) run and since then also takes the filter to fish waste and other suspended particles much more efficiently on. The water has become crystal clear and I take the pump even when oxygen diffuser (sucking air with a pump when placed 10 cm below the water level) and also serves as a surface cleaner (skimmer). It produces a very strong water movement, the angle can be adjusted easily using the magnet holder, makes no noise and is very efficient. If you have sand as substrate have to be careful because this is whirled. Not suitable for small aquariums under 500 liters, unless you hold very strong flow loving fish!
