A School of Powder Blue
Here’s a sight you’ll never see in your aquarium: a large school of powder blue
tangs (Acanthurus leucosternon) getting along swimmingly well with each other.
Although an herbivore, the powder blue tang is quite aggressive, especially
toward those of its kind and any other vegetarians browsing in its territory. At
home, keep only one per spacious aquarium with plenty of unobstructed
swimming room, and choose tankmates carefully.