Rainbow Thread Fin - Planted Tank Fish - Pair

T0he Rainbow Thread Fin, also known as Iriatherina werneri, is a delicate and visually stunning freshwater fish that adds grace to any planted tank. This species is admired for its elongated, flowing fins that resemble delicate threads, and its body shimmers with a spectrum of colors ranging from soft gold to iridescent blues and greens.

Quick Factors

• Common Names: Rainbow Threadfin, Featherfin Rainbowfish, Threadfin Rainbowfish
• Size: 1.2–2 in (3–5 cm)
• Coloration: Iridescent blue, green, and gold body; males have long flowing fins with red, orange, and yellow accents
• Tank Size: 15 gallons minimum (larger preferred for groups)
• Water Temp: 72–86°F (22–30°C)
• pH Range: 5.0–8.0 (soft, slightly acidic preferred)
• Temperament: Peaceful, shy, social; males display with fin-dancing
• Diet: Omnivore – micro-pellets, crushed flakes, live & frozen micro foods
• Tank Setup: Heavily planted, soft water, gentle flow, tight lid (jumpers)
• Breeding: Egg scatterer; fry need infusoria or micro food
• Lifespan: 3–5 years