Threadfin Rainbowfish (Iriatherina werneri) – Elegant and Graceful Nano Fish for Planted Aquariums
The Threadfin Rainbowfish, Iriatherina werneri, is a delicate and stunning nano fish prized for its long, flowing finnage and shimmering, translucent body with subtle iridescent hues. Known for their graceful swimming and peaceful nature, these fish add a touch of elegance to any planted or community aquarium.
Native to freshwater streams in Australia and New Guinea, Threadfin Rainbowfish thrive in soft, slightly acidic water with stable conditions. They do best in well-planted tanks with plenty of swimming space and are happiest in schools of six or more, where their social behaviors truly shine.
Species: Iriatherina werneri
Common Name: Threadfin Rainbowfish
Size Shipped: ~0.5–0.75” juveniles
Adult Size: ~1.5–2 inches
Temperament: Peaceful, shy, active
Swimming Level: Mid to top water
Schooling: Best kept in groups of 6+
Lifespan: 3–5 years
Origin: Tank-raised (not wild-caught)
Temperature: 72°F – 82°F (22°C – 28°C)
pH: 6.0 – 7.5
GH: 3 – 8
KH: 1 – 5
Minimum Tank Size: 15 gallons (20+ gallons for groups)
Filtration: Gentle flow preferred
Aquascape: Heavily planted with open swimming areas
✔ Distinctive long, flowing fins and elegant appearance
✔ Peaceful, ideal for calm community tanks
✔ Enhances visual appeal with subtle iridescence
✔ Active swimmers that thrive in planted setups
✔ Compatible with shrimp and small peaceful fish
High-quality micro pellets and flakes
Live or frozen foods: daphnia, baby brine shrimp, microworms
Feed small amounts 1–2 times daily
Threadfin Rainbowfish (Iriatherina werneri) – Elegant and Graceful Nano Fish for Planted Aquariums
The Threadfin Rainbowfish, Iriatherina werneri, is a delicate and stunning nano fish prized for its long, flowing finnage and shimmering, translucent body with subtle iridescent hues. Known for their graceful swimming and peaceful nature, these fish add a touch of elegance to any planted or community aquarium.
Native to freshwater streams in Australia and New Guinea, Threadfin Rainbowfish thrive in soft, slightly acidic water with stable conditions. They do best in well-planted tanks with plenty of swimming space and are happiest in schools of six or more, where their social behaviors truly shine.
Species: Iriatherina werneri
Common Name: Threadfin Rainbowfish
Size Shipped: ~0.5–0.75” juveniles
Adult Size: ~1.5–2 inches
Temperament: Peaceful, shy, active
Swimming Level: Mid to top water
Schooling: Best kept in groups of 6+
Lifespan: 3–5 years
Origin: Tank-raised (not wild-caught)
Temperature: 72°F – 82°F (22°C – 28°C)
pH: 6.0 – 7.5
GH: 3 – 8
KH: 1 – 5
Minimum Tank Size: 15 gallons (20+ gallons for groups)
Filtration: Gentle flow preferred
Aquascape: Heavily planted with open swimming areas
✔ Distinctive long, flowing fins and elegant appearance
✔ Peaceful, ideal for calm community tanks
✔ Enhances visual appeal with subtle iridescence
✔ Active swimmers that thrive in planted setups
✔ Compatible with shrimp and small peaceful fish
High-quality micro pellets and flakes
Live or frozen foods: daphnia, baby brine shrimp, microworms
Feed small amounts 1–2 times daily
