Like the original Berlin, the new Red Sea Berlin X2 Turbo features a new high performance pinwheel impeller and is rated for saltwater fish only tanks up to 225 gallons, LPS only tanks up to 125 gallons and SPS tanks up to 75 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