Affordable and easy-to-install in-tank refugium Suction-mount inside aquariums to create a safe refuge Isolate injured fish or monitor sensitive corals, invertebrates, and new arrivals The In-Tank Refugium is a "safe house" that provides a protected area within an aquarium. Helps newly added fish or invertebrates easily acclimate to a new aquarium. Provides a haven for injured fish or corals, without the need for a separate quarantine aquarium. Also functions as a culturing area for small organisms that will eventually become a food source. 7-3/4" x 4" x 7-1/2" high. Large In-Tank Refugium (12" x 6" x 8" high) offers more space for larger aquariums. Both include a powerhead to keep fresh water flowing through the refugium at all times. Downloadable In-Tank Refugium Instructions PDF . (Requires Adobe Acrobat Reader 4.0 or later - get it here for free ) Please click on "More Information" for installation instructions.