A reef tank is a type of aquarium designed to replicate a natural coral reef environment. It typically contains live corals, various species of fish, and other marine organisms. The goal is to create a balanced ecosystem that supports the health and growth of these organisms, often requiring specific water conditions, lighting, and filtration systems. Maintaining a reef tank involves regular monitoring of water parameters such as temperature, salinity, and pH. Hobbyists often use equipment like protein skimmers and live rock to enhance water quality. Popular species found in reef tanks include clownfish, anemones, and various types of coral.