It allows us to see the coral world inside the fish tank from the top of the water. No need to shut down main pump, convenient and practical. Can even set up your camera above the viewing mirror, to shoot your exclusive coral photos, photography enthusiasts are essential tools. There are three specifications for you to choose the one that suits you best. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.