Octopus MF800B Hang-On Media Reactor Kit with Pump. New Reef Octopus Hang On Media Reactor Kit with Feed Pump These Fluidized Media Reactor kits have everything you need but the media itself for you operate. Comes with a feed pump, hoses and all fittings required for installation. Specifications: * Item #: MF800B * MF-800 Hang on Media Reactor with 2000l/h feed pump 500gph * Diameter: 4″ * Height: 18.5″ * Footprint: 5.5″ x 5.5″ * Media Not Included.