Vampire Tang

Vampire Tang

The Vampire Tang (Acanthurus tennentii), also called the doubleband or lieutenant surgeonfish, is a striking Indian Ocean tang — a blue-grey oval body marked with two curved black "fang"-like lines behind the eye (the source of its evocative common name) and a yellow-edged caudal spine. Hardy and handsome, it makes a fine centrepiece for a large reef or fish-only aquarium, combining good looks with a reasonably manageable temperament for a big surgeonfish.

Its bold shoulder markings and substantial size give it real presence in a large tank.

Natural Habitat & Origin

Acanthurus tennentii is found in the Indian Ocean, where it grazes algae over coral and rocky reefs and reef slopes. It ranges widely over the reef as it feeds, and adults are powerful, active swimmers.

In the aquarium it wants open swimming space, abundant live rock for grazing, and strong, well-oxygenated water movement.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F), with good flow and oxygenation. Reaching about 30 cm (12 inches), it is an active fish that needs a large tank — on the order of 450 litres (around 120 US gallons) or more — for swimming and grazing. It is hardy and adaptable once established.

Diet & Feeding

The Vampire Tang is a herbivore that grazes on algae in the wild. Offer a primarily plant-based diet: dried marine algae (nori) on a clip, herbivore and spirulina preparations, and algae-based frozen foods, with occasional meaty items. Frequent small feedings suit its constant grazing, and good algae growth on mature live rock provides valuable grazing between meals.

Behavior & Temperament

Like other surgeonfish, it is semi-aggressive and territorial, particularly toward other tangs. It is best kept as the only tang in all but very large systems, and introduced thoughtfully. Its sharp caudal spine is a defensive weapon, so handle with care. Toward unrelated fish it is generally manageable for a large tang.

Tank Mates

House it with robust marine fish in different niches — wrasses, angelfish, larger gobies and anthias — in a tank large enough to dilute aggression. Avoid other tangs unless the system is very large. It is reef-safe, grazing algae rather than corals or invertebrates, making it a good choice for a large reef.

Breeding

Acanthurus tennentii is a pelagic spawner with planktonic larvae and is not bred in the home aquarium. Trade specimens are wild-collected.

Common Health Issues

Like other surgeonfish, the Vampire Tang is susceptible to marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), especially when stressed by capture and shipping. A careful quarantine and a stable, oxygen-rich environment are essential. Provide pristine water, strong flow and a varied herbivorous diet, and this handsome, boldly marked tang is a hardy and rewarding centrepiece for an intermediate keeper with a large reef.