A trouble-free biological filter designed with adjustable 1"" dia, uplift tubes for better water circulation and multi-plate constructionf or easy installation, Includes airline tubing and Discard-A-Stone and features the fish-saver elbow, Advanced design allows a separate plate installation and also has optional flow-thru set-up for use with a power head, Made f special quality plastic which resists splitting and creaking, available in three different styles to fit rectangular, hexagonal, octagonal, and flatback aquariums, Packaging Boxed, SKU: RYLHC2954