Fish tanks, also known as aquariums, are a popular way to keep fish as pets. They come in many shapes and sizes and can be filled with a variety of fish, such as tetras. Fish tanks also require regular maintenance, such as cleaning and feeding the fish, as well as changing the water regularly. Some people even add plants and decorations to their fish tanks to make them more aesthetically pleasing. Fish tanks can also be used to create a STEW, which is a type of soup made from fish and vegetables.