Wave maker is widely used in large fish tanks, for example tank for arowanas, blood parrots cichlids, koi, etc. These fish are likely to cause stubby and obesity in a calm environment. Using wave maker can create artificial air currents and waves. The fish will swim against the current and can help maintaining a beautiful body shape. The water flow also increase the amount of dissolved oxygen in the tank, which is beneficial to the healthy growth and development of fish. Many aquarists have encountered the phenomenon of excrement deposits on the bottom of the fish tank and feed residues, which cannot be filtered by the filter. Especially aquarists who raise blood red parrots and other large fish. At this time, this wave maker will offer you a big help. Set up a wave maker in the opposite direction of the filter. The wave will helps to bring the excrement through the water flow to the filter and achieve a cleaning effect. Model: 820 Watt: 36w F.Max: 25000L/H Tank Size: 180-200cm