A fish tank is a container designed to hold water and house aquatic life, such as fish and plants. These tanks can vary in size, from small bowls to large aquariums, and are often made of glass or acrylic. Proper filtration, heating, and lighting are essential for maintaining a healthy environment for the fish and other organisms. To create a balanced ecosystem, fish tanks require regular maintenance, including water changes and cleaning. Many fish enthusiasts enjoy decorating their tanks with substrates, rocks, and plants, which can provide hiding spots and enhance the aesthetic appeal. Popular fish species for tanks include goldfish, betta fish, and neon tetras.