The Heniochus Butterfly is commonly referred to as the Longfin Bannerfish, which has a very elongated white dorsal filament and gives it a unique appearance. This fish is an excellent substitute for the much more difficult to keep, Moorish Idol. The Heniochus Butterfly has a white colored body with two wide black stripes, and makes a captivating addition to any tank. The Heniochus Butterfly grows up to 9 inches in the wild but is usually imported at about 2-4 inches and should be kept in a tank not less than 55 gallons. Since it is a peaceful fish, the Heniochus Butterfly should not be housed with any predatory or aggressive fishes. If you wish to keep a group, then the Heniochus Butterfly should be added simultaneously to avoid any territorial issues. The Heniochus Butterfly prefers a diet of small meaty foods and herbivore preparations for its continued good health. The Heniochus Butterfly requires a tank with plenty of live rocks that encourages the growth of algae on which it can feed in between. The Heniochus Butterfly also needs caves and crevices in the tank, where it can hide or take refuge when required. The Heniochus Butterfly thrives well in a temperature range of 72-78 degrees Fahrenheit and pH of 8.1-8.4.