Purple tang

Environment

Aquarium of minimum 500 liters for an adult individual, ideally 600-800 L to ensure optimal comfort and sufficient swimming space. Rocky décor offering hiding spots and refuge zones, with significant open swimming space. Requires stable reef water: temperature 24-28°C, pH 8.0-8.4, salinity 33-36 g/L, calcium 400-450 mg/L. Moderate to strong circulation (10-20 times volume/hour).

Feeding

Strictly herbivorous. Multiple feedings per day (3-4 times minimum): marine algae (nori, spirulina), flakes and pellets for herbivores, blanched vegetables (zucchini, spinach, broccoli). Encourage natural grazing on live rock and glass. May accept supplements based on mysis enriched with spirulina. Regular supply of fresh vegetation is essential for digestive and immune health. Underfeeding causes rapid weight loss and weakening.

Health & common diseases

Susceptible to common parasitic diseases: marine ich (Cryptocaryon irritans), marine velvet (Amyloodinium, Oodinium), which manifest as white/golden spots, scratching, accelerated breathing. Prevention: strict quarantine of 4-6 weeks for any new fish, optimal water quality, varied diet. Very sensitive to stress, pollution (nitrates, phosphates) and parameter fluctuations. Tangs are prone to secondary bacterial infections (lateral line erosion, necrosis) in case of injuries or prolonged stress. Can develop nutritional deficiency (weight loss, hole in the head) if herbivorous diet is insufficient. Beware of sharp caudal scalpels during handling.

Tips & tankmates

Territorial, especially towards other Zebrasoma and similarly-shaped tangs. Introduce last into the tank or simultaneously to reduce aggression. Compatible with most other non-aggressive reef fish. Excellent algae grazer, contributes to tank cleaning. Patience necessary for acclimation: may refuse to feed the first days. Favor young specimens in good health (rounded belly, active swimming). Robust species once acclimated, but demands rigor and stability. Never purchase an emaciated specimen. Respect welfare: space, dietary variety, nocturnal rest.

Sources

• FishBase - Zebrasoma xanthurum
• Reef2Reef - Purple Tang Care Guide
• Marine Species Identification Portal