Green Chromis

The Green Chromis (Chromis viridis) is a peaceful and active schooling fish known for its vibrant green-blue coloration. A popular choice among reef aquarists, this hardy species thrives in groups and adds movement and color to the aquarium.

(REEF SAFE / BEGINNER)

Essential Information:

• Common Names: Green Chromis, Blue-Green Chromis
• Scientific Name: Chromis viridis
• Family: Pomacentridae
• Origin/Habitat: Native to the Indo-Pacific, commonly found in shallow lagoons and coral reefs.
• Maximum Size: Up to 4 inches (10 cm)
• Lifespan: Typically 5–8 years with proper care
• Level of Difficulty: Beginner-friendly; thrives in community reef tanks with stable water conditions.

Appearance & Physical Traits:

• Coloration & Pattern: Iridescent green-blue body with a slightly darker dorsal area.
• Body Shape & Structure: Laterally compressed, oval-shaped body built for fast swimming.

Habitat & Environmental Needs:

• Minimum Tank Size: 30 gallons (113 liters) for a small group; larger tanks (50+ gallons) are recommended for larger schools.
• Water Temperature: Maintain between 74°F and 80°F (23°C to 27°C).
• pH Level: Keep between 8.1 and 8.4.
• Specific Gravity: Optimal range is 1.023 to 1.025.
• Aquascape: Provide ample open swimming space with live rock for hiding spots.

Diet & Feeding:

• Diet Type: Omnivorous
• Preferred Foods: High-quality marine pellets, flakes, frozen mysis shrimp, brine shrimp, and algae-based foods.
• Feeding Frequency: Feed 2–3 times daily in small amounts.

Behavior & Compatibility:

• Temperament: Peaceful and social; best kept in groups of at least 5 to prevent aggression.
• Social Behavior: Forms tight schooling groups and is highly active.
• Tank Mate Compatibility: Compatible with most peaceful reef fish; avoid keeping with aggressive species that may intimidate them.
• Activity Level: Constantly swimming in open water, often near the top or middle of the tank.

Care Considerations & Additional Notes:

• Ease of Care: An excellent choice for beginners due to its hardy nature and adaptability.
• Special Requirements: Best kept in odd-numbered groups (5+), as they may establish a hierarchy with minor aggression.
• Breeding Info: Can spawn in captivity, with males guarding the eggs until they hatch.
• Additional Notes: The Green Chromis is completely reef-safe and will not harm corals or invertebrates. Proper grouping and adequate space help prevent dominant individuals from harassing weaker members of the school.