Like the original Berlin, the new Red Sea Berlin X2 Venturi features a high flow venturi injector and is rated for saltwater fish only tanks up to 150 gallons, LPS only tanks up to 100 gallons and SPS tanks up to 50 gallons. A hang-on back conversion kit is included with the skimmer. The Berlin X2 is the latest evolution of the popular Berlin range of skimmers used by thousands of aquarists around the world.Features:For in sump or hang-on use (optional hang-on kit included)For aquariums up to 250 gallonsComes complete with pumpGreater skimming performance than the original Berlin skimmerImproved long term pollutant reductionUnique foam view collection cupQuick fitting inner parts for easy maintenance