Black-bar Chromis

The Black-bar Chromis (Chromis retrofasciata) is a small, peaceful marine fish native to the Indo-Pacific region. Recognized for its distinctive black vertical bar near the tail and vibrant coloration, it is a popular choice among aquarium enthusiasts.

(REEF SAFE / BEGINNER)

Essential Information:

• Common Names: Black-bar Chromis, Black-axil Chromis
• Scientific Name: Chromis retrofasciata
• Family: Pomacentridae
• Origin/Habitat: Found in the Indo-Pacific region, including areas such as Indonesia, the Philippines, and the Solomon Islands.
• Maximum Size: Up to 2 inches (5 cm)
• Lifespan: Typically 5 years; can live up to 7 years with proper care.
• Level of Difficulty: Beginner; hardy and adaptable, making it suitable for novice aquarists.

Appearance & Physical Traits:

• Coloration & Pattern: Tan to yellow body with a distinctive black vertical bar near the tail; neon blue ring around the eyes and along the edge of the fins.
• Body Shape & Structure: Small, elongated body with a slightly compressed shape and a prominent dorsal fin.

Habitat & Environmental Needs:

• Minimum Tank Size: A 30-gallon (114 liters) tank is recommended.
• Water Temperature: Maintain between 72°F and 78°F (22°C to 25°C).
• pH Level: Keep between 8.1 and 8.4.
• Specific Gravity: Optimal range is 1.020 to 1.025.
• Aquascape: Provide live rock with ample hiding spots and open swimming areas.

Diet & Feeding:

• Diet Type: Omnivorous
• Preferred Foods: High-quality flake foods, frozen mysis shrimp, and vitamin-enriched brine shrimp.
• Feeding Frequency: Feed small amounts 2 to 3 times daily to accommodate their high metabolism.

Behavior & Compatibility:

• Temperament: Generally peaceful; may be shy initially but becomes more outgoing over time.
• Social Behavior: Best kept in groups of odd numbers (5 or more); single specimens may be harassed by tank mates.
• Tank Mate Compatibility: Compatible with most peaceful marine species; avoid aggressive fish that may stress the Black-bar Chromis.
• Activity Level: Moderately active, often seen darting between rocks and occasionally resting in crevices.

Care Considerations & Additional Notes:

• Ease of Care: Ideal for beginner hobbyists due to its hardiness and adaptability.
• Special Requirements: Requires a well-established aquarium with stable water parameters and a consistent food supply.
• Breeding Info: Little is known about breeding the Black-bar Chromis in captivity.
• Additional Notes: The Black-bar Chromis is an excellent choice for reef tanks, as it is reef-safe and provides interesting behavior as it interacts with its environment. It can sometimes be territorial with other chromis but generally coexists peacefully with other fish.