Half Black Angelfish

Also known as the Bicolor Angelfish or Oriole Angelfish

The Half Black Angelfish is a striking marine species known for its dramatic two-tone coloration—a vibrant yellow anterior half and deep blue to black posterior half, separated by a clean vertical division. Native to the Indo-Pacific region, this medium-sized angelfish brings bold contrast and personality to marine aquariums.

Key Features

• Scientific Name: Centropyge vroliki
• Common Names: Half Black Angelfish, Bicolor Angelfish, Oriole Angelfish, Two-Colored Angelfish
• Adult Size: Up to 5–6 inches
• Lifespan: 5–12 years with proper care
• Temperament: Semi-aggressive; can be territorial, especially toward other dwarf angels
• Reef Compatibility: Not reef-safe – will nip at corals, clam mantles, and other sessile invertebrates
• Minimum Tank Size: 70 gallons
• Experience Level: Intermediate

Habitat & Tank Requirements

• Tank Environment: Provide ample live rock with caves, crevices, and hiding spots. The Half Black Angel needs territories to establish and explore, mimicking its natural reef habitat.
• Water Parameters:
  • Temperature: 72–78°F (22–26°C)
  • Salinity: 1.023–1.025
  • pH: 8.1–8.4
  • Ammonia/Nitrite: 0 ppm
  • Nitrate: <20 ppm
• Aquascape: Dense live rock formations are essential for grazing on natural algae and providing shelter.
• Compatibility: Best kept as the only dwarf angelfish in the tank. Can coexist with semi-aggressive tank mates of different species but may harass peaceful fish. Avoid housing with other Centropyge angels unless in very large systems (150+ gallons).

Diet & Feeding

Half Black Angelfish are omnivores requiring a varied diet rich in both algae and meaty foods:

• Plant Matter: Marine algae, spirulina, nori sheets, high-quality herbivore pellets
• Meaty Foods: Mysis shrimp, finely chopped seafood, vitamin-enriched brine shrimp, marine fish flakes
• Specialty Items: Foods containing sponge material (important for long-term health)
• Feeding Schedule: Feed 2–3 times daily in small portions to maintain health and vibrant coloration

Notes & Considerations

• Behavior: While generally hardy once established, the Half Black Angelfish can be initially shy. They become bolder over time and may display territorial aggression, particularly in smaller tanks.
• Coral Compatibility: Known to nip at LPS corals, soft corals, zoanthids, and clam mantles. Not suitable for reef aquariums with prized coral specimens.
• Acclimation: Can be sensitive during initial acclimation. Stable water parameters and a stress-free introduction are critical for success.
• Gender: Sexual dimorphism is minimal; males may be slightly larger. This species is a protogynous hermaphrodite (females can transform into males). Captive breeding is rare but has been documented.
• Regional Variants: Coloration intensity can vary based on geographic origin (Pacific vs. Indian Ocean populations).

Why Choose a Quarantined Half Black Angelfish?

Our quarantined Half Black Angelfish are carefully acclimated, monitored for disease, and conditioned on a nutritious diet before sale. This ensures you receive a healthy, parasite-free specimen that’s ready to adapt to your aquarium, reducing stress and increasing long-term success.