The Red Sea Prizm Pro Deluxe Hang-on Protein Skimmer is the high capacity version of the original Prizm Skimmer Measuring in at 20" tall, 3.5" thick, and 13" wideDesigned to work in saltwater aquariums up to 250 gallons and reef aquariums up to 125 gallonsIncludes a pump, surface skimmer attachment and media basketUtilizing the same Turbo-Jet and convergent divergent technology that made the Prizm successful