Azure Damselfish

Also known as the Half-Blue Damselfish or Yellowtail Damselfish

The Azure Damselfish are smaller in size yet bold and tough enough to protect themselves from other fish with their beautiful contrast color they create an lively surroundings they are good at handling different tanks and conditions it is comfortable for both beginner and advanced setups since they are good at adaptability and they are playful in nature need enough space to hide in the tank and they naturally live in warm ocean areas indo-Pacific 

Key Features

Scientific Name: Chrysiptera hemicyanea

Common Names: Azure Damselfish, Half-Blue Damselfish, Yellowtail Damselfish

Adult Size: 2–3 inches (5–7.5 cm)

Lifespan: 5–10+ years with proper care

Temperament: Semi-aggressive; may defend territory but generally peaceful in larger tanks

Reef Compatibility: Reef-safe – will not harm corals or invertebrates

Minimum Tank Size: 20 gallons (30+ gallons recommended for groups)

Experience Level: Beginner – extremely hardy and adaptable​

Habitat & Tank Requirements

Natural Habitat:

Azure Damselfish are found in some places where the water is calm to moderate, such places are Fiki, Indonesia, and the Philippines, and they live near the surface so they can hide easily with the help of coral and rocks.

Tank Environment:

• Provide rockwork with caves and crevices for security.
• Open swimming areas combined with moderate water flow.
• Works well singly or in small groups in larger tanks (40+ gallons).
• Stable, established aquariums are recommended for the best behavior

Water Parameters:

Temperature: 74–80°F (23–27°C)

Salinity: 1.023–1.025 specific gravity

pH: 8.1–8.4

Ammonia/Nitrite: 0 ppm

Nitrate: <20 ppm (lower preferred)

Alkalinity: 8–12 dKH

Essential Equipment:

• Quality protein skimmer (recommended for systems over 30 gallons).
• Efficient filtration system.
• Stable, moderate lighting.
• Consistent water changes (10–15% weekly or 20% biweekly).

Diet & Feeding

Azure Damselfish don’t eat only algae; they eat both animal and plant-based food.

Recommended Foods:

Pellets/Flakes: Marine micro-pellets, spirulina flakes, color-enhancing blends.

Frozen Foods: Mysis shrimp, brine shrimp, plankton, finely chopped seafood.

Plant Matter: Spirulina, marine algae sheets (occasional).

Prepared Mixes: Omnivore blends, enriched frozen options.

Enrichment: Vitamin-soaked foods and garlic additives for immune health.

Feeding Schedule:

• Feed 1–2 times daily.
• Offer small portions consumed within 2–3 minutes.
• Variety enhances coloration, energy, and long-term health.

Behavior & Compatibility

Temperament:

• Active, confident, and curious.
• May display territorial behavior, especially in smaller tanks.
• Generally peaceful in community reef setups.
• Quick acclimators with bold personalities.

Tank Mates:

Compatible with: Peaceful community fish such as gobies, wrasses, blennies, tangs, cardinalfish, dartfish, and firefish.

Caution with: Aggressive dottybacks or larger semi-aggressive species.

Avoid: Keeping with other very aggressive fish in small tanks.

Breeding Potential

Azure Damselfish breed if there is a stable tank and need their own space, and the male protects the eggs until the baby fish come out. And they need a separate space to raise a baby fish because they are tiny and need special tiny foods in the tank.

​Why Choose Us

At Dr Reefs, every Azure Damselfish undergoes a thorough quarantine process by monitoring them. Each fish is kept in a separate tank for several weeks, and staff watch them closely. If there is any early illness, they have been treated with good care. During this time, fish learn conditioned behavior and are trained to eat different foods so they are good at adaptability. Choosing Dr Reefs means you are getting highly trained and healthy Azure Damselfish.