Danio rerio var. Butterfly Fin Green – 4–4.5 inches

Appearance

This variant of the Zebra Danio exhibits lush, elongated butterfly tail and dorsal fins, paired with a vibrant neon green body—creating a stunning, graceful presence in any aquarium setting.

Size

• Adult length: Approximately 4–4.5 inches, including fin extensions.

• Overall silhouette looks larger due to the flowing butterfly fin morphology.

Behavior & Social Dynamics

• Highly active schooling fish, best kept in groups of 6 or more to encourage natural behavior and reduce stress.

• Peaceful and community-friendly. Their delicate long fins do make them susceptible to fin-nipping, so choose tankmates carefully.

Tank Conditions

• Minimum Tank Size: 20 gallons, to accommodate energetic schooling behavior.

• Water Temperature: 22–26 °C (72–79 °F).

• pH Range: 6.5–7.5.

• Hardness: Soft to moderately hard water.

• Vinishes in a setup featuring open mid-to-upper swimming zones, occasional plants for contrast, and gentle filtration to protect their fins.

Diet

• Omnivorous—eat a varied diet including high-quality flakes, micro-pellets, and live or frozen foods like brine shrimp or daphnia. A diverse diet encourages stronger emerald hues.

Lifespan

• Expected life expectancy is 3–5 years with proper care, stable water conditions, and good nutrition.