Fluval AquaClear Surface Skimmer (20/30/50) – A surface skimmer attachment for AquaClear 20, 30, and 50 filters that automatically removes oily films and debris from the aquarium surface. By drawing water from the top, it eliminates the unsightly bio-film that can form and improves oxygen exchange. The Fluval surface skimmer helps maintain a crystal-clear water surface and promotes higher oxygen levels in the tank, contributing to a healthier aquatic environment.