Blue Tang (Paracanthurus hepatus)
The Blue Tang is one of the most recognizable and beloved marine fish, famous for its vibrant royal blue body, bold black “palette” pattern, and bright yellow tail. Found throughout the Indo-Pacific, it inhabits outer reef slopes and lagoons, often seen darting among coral heads and crevices. As a herbivore, it contributes to reef health by grazing on algae, though its diet may include small invertebrates in the wild. While visually stunning, it requires careful husbandry due to its sensitivity to water quality and susceptibility to marine ich. Active and social, it thrives best in spacious tanks with ample swimming room.
 
Size: Up to 12 inches (30 cm)
Tank Size: Minimum 180 gallons (smaller juveniles may start in 120+, but larger space is ideal long-term)
Care Level: Moderate to Difficult (prone to stress and disease if conditions fluctuate)
Diet: Primarily herbivorous – eats marine algae, seaweed, spirulina; may accept some meaty foods
Aggression Level: Generally peaceful – can be territorial toward other tangs or similar body shapes