The second generation of Coralife Biocube Protein Skimmers has finally arrived! The new and improved units feature a sleek and slender design, a self-priming pump and a cone shaped inner chamber that significantly enhances the effectiveness of active skimming, removing harmful dissolved organics and ensuring your aquarium water is as clean and healthy as possible. The needle wheel Coralife Biocube Protein Skimmer boasts an adjustable airflow that provides greater versatility and freedom of use in different aquarium circumstances and the easily accessible, removable collection cup makes maintenance and cleaning a piece of cake. This in-tank protein skimmer is designed for use with the Coralife BioCube Aquariums 16, 29 and 32 models, but an additional hanging clip allows for compatibility with standard saltwater tanks up to 32 gallons in size.