A reef tank is a type of aquarium designed to replicate a coral reef ecosystem. It typically contains live corals, fish, and other marine organisms, creating a vibrant underwater environment. Maintaining water quality, temperature, and lighting is crucial for the health of the inhabitants, as these factors closely mimic their natural habitat. Reef tanks often use specialized equipment, such as protein skimmers and filtration systems, to keep the water clean and oxygenated. Hobbyists may also incorporate live rock and sand to provide natural filtration and habitat for beneficial bacteria. Proper care and attention can lead to a thriving and beautiful reef display.