Threadfin Rainbowfish- 2.5cm

Species Profile

• Scientific Name: Iriantherina werneri.
• Common Name: Threadfin Rainbowfish
• Adult Size: 0.75 to 1 inch (2 to 2.5 cm)
• Life Expectancy: 3 to 5 years
• Habitat: Endemic to Lake Inle in Myanmar; found in shallow, plant-dense waters with slow flow and soft, slightly alkaline water

Tank Requirements

• Minimum Tank Size: 10 gallons (38 liters), larger preferred for groups
• Ideal Temperature: 70–78°F (21–26°C)
• pH Range: 6.5–7.5
• Water Hardness: Soft to moderately hard (3–10 dGH)
• Temperament: Peaceful but shy; best kept in schools of at least 6–8 to reduce stress and encourage natural behavior

Diet & Nutrition

• Omnivorous: Yes — thrives on a diet of micro pellets, finely crushed flakes, and small live or frozen foods such as daphnia, baby brine shrimp, and micro worms

Appearance

• Iridescent emerald-green body with horizontal blue-green stripes
• Bright orange fins and subtle red or orange coloration on the face and belly
• Males are more colorful and slender; females are slightly rounder and duller in color

Distinctive Features

• Stunning metallic green coloration rare among small freshwater fish
• Ideal for planted nano tanks with gentle filtration and subdued lighting
• Displays interesting social behaviors when kept in groups
• May be intimidated by larger or overly active tankmates — ideal for peaceful community or species-only setups