The Hydor Rotating Water Deflector rotates 360 degrees as it is pushed by the power of a pump pushing the water through the deflector. This creates a wave effect that moves plants and anemones in a very natural and visually pleasing manner. Features:Comes with a variety of connectors for connecting to the outlet of a pump or filterAppropriate for powerheads from 80 to 310 gph (see Rio powerheads and Aquarium Systems powerheads)Moves the aquarium water increasing oxygenation and surface gas exchange preventing the formation of the "white line" effectsCreates a beneficial wave effect which moves plants and invertebratesFunctions with no extra energy consumption