Rasbora Axelrodi Blue - 1.5cm

Species Profile

• Scientific Name: Sundadanio axelrodi var. “blue”
• Common Name: Rasbora Axelrodi Blue
• Adult Size: 0.6 to 0.8 inches (1.5 to 2 cm)
• Life Expectancy: 3 to 5 years
• Habitat: Native to peat swamp forests and blackwater streams of Borneo and Sumatra; found in shallow, warm, acidic waters rich in tannins and leaf litter

Tank Requirements

• Minimum Tank Size: 5 gallons (19 liters), ideally 10+ gallons for a group
• Ideal Temperature: 72–80°F (22–27°C)
• pH Range: 4.0–6.5
• Water Hardness: Very soft (1–6 dGH)
• Temperament: Peaceful and shy; best kept in groups of 8 or more to encourage natural schooling and reduce stress

Diet & Nutrition

• Omnivorous: Yes — consumes micro invertebrates and plant matter in the wild. In the aquarium, it thrives on crushed flakes, high-quality nano pellets, and tiny live or frozen foods like baby brine shrimp, daphnia, or microworms.

Appearance

• Very small and slender with a metallic blue sheen running along the body
• Transparent fins and body reveal subtle reddish or copper undertones depending on lightin
• Males are more colorful and display a more intense blue, especially during displays

Distinctive Features

• One of the smallest nano fish in the hobby
• Intense blue coloration, especially under subdued lighting and in dark, tannin-stained water
• Ideal for blackwater or biotope-style aquariums
• Very sensitive to water quality — requires excellent maintenance and stable conditions
• May be outcompeted for food in community tanks, so tankmates must be gentle and small