Atlantic Blue Tang (large 4 -7 inches (Caribbean Tang)The Blue Tang could be considered the definitive fish of saltwater aquariums. The Pacific Yellow Tang is a constant swimmer that will glide throughout your aquarium acting as a local aquarium tour guide. It is best to be in an aquarium of at least 30 gallons or larger with plenty of room to swim. Like other Tangs, it demonstrates territorial aggression towards its own species. It would be best to keep just one Blue Tang per aquarium, unless they are