Clown Tangs usually appreciate some sort of hiding place in their aquarium. Often, rocks or coral are used to create such a sanctuary. These items may also aid in providing algal growth for your Clown Tang to feed on. These fish are grazers in nature, eating constantly. In captivity it is best to introduce them only into well-developed systems. They can become very aggressive and prefer aquariums with lots of water movement. Because of their size and temperament, Clown Tangs are not recommended for beginning marine aquarists. They tend to have fairly high mortality rates for captive tangs. At maturity, many Clown Tangs reach lengths of ten to 15 inches (25 to 38 centimeters).