LUCKSTAR Aquarium Filter Surface Skimmer The fish Tank Cleaner Inhaled impurities on the surface and the oil film. Through biochemical cotton to wipe off. Increase in the oxygen content in the aquarium. To the corresponding water level change caused by evaporation. With a suction cup, can be used convenient fixed in the tank cylinder walls. Have adjustive function, can be adjusted according to different specifications of the tank water yield.