TL Reefs Media Reactor 8"Fluidized Media Chamber The TL Reefs Media Reactor features quality construction and ease of use. This fluidized media chamber can be used with your favorite media, including GFO, Biopellets, and Carbon. Can be used internal or external to your sump. Tight sealing lid, high quality acrylic, and precision seams make it completely watertight. Upflow fluid movement creates a gentle flow and the dispersion plate ensure even, gentle tumbling of your media.