Threadfin Rainbowfish for Sale (Iriatherina werneri)

The Threadfin Rainbowfish is one of the most elegant and eye-catching nano fish available, prized for its flowing fins, peaceful temperament, and mesmerizing display behavior. Perfect for planted aquariums, these delicate yet active fish bring constant movement and natural beauty to any tank.

Native to slow-moving, plant-rich waters, Threadfin Rainbowfish thrive in calm, well-maintained environments and display their best colors and behavior when kept in groups. Males are especially known for their unique “dancing” displays, making them a standout centerpiece in peaceful community and shrimp tanks.

If you’re looking for a shrimp-safe, visually striking nano fish that adds both elegance and activity to your aquarium, Threadfin Rainbowfish are an exceptional choice.

Threadfin Rainbowfish Quick Facts

• Scientific Name: Iriatherina werneri
• Common Names: Threadfin Rainbowfish, Featherfin Rainbowfish
• Care Level: Easy to Moderate
• Temperament: Extremely peaceful
• Size: 1.5–2 inches (adult)
• Lifespan: 2–4 years
• Tank Size: 10–20+ gallons recommended
• Water Temperature: 75–82°F
• pH Range: 6.0–7.5
• Diet: Omnivore (micro pellets, flakes, frozen & live foods)
• Schooling: Yes — keep in groups of 6+
• Tank Setup: Heavily planted, gentle flow
• Shrimp Safe: ✅ Yes
• Breeding: Egg scatterer (possible in planted tanks)

Bring Graceful Movement and Living Art to Your Aquarium

Looking to create a tank that truly stands out? The Threadfin Rainbowfish transforms any aquarium into a peaceful, flowing display of color and motion. With their delicate fins and constant, dance-like movement, these fish don’t just swim—they perform.

Perfect for planted and shrimp tanks, Threadfin Rainbowfish add a sense of calm elegance that few other nano fish can match. If you want an aquarium that feels alive, natural, and captivating every time you look at it, this is the species that delivers.

How many Threadfin Rainbowfish Should Be Kept Together?

• Minimum: 6
• Best: 8–12 for best color + behavior

Diet & Feeding for Threadfin Rainbowfish

• Tiny mouths → need small foods
• Baby brine shrimp, Daphnia, crushed flakes

Tank Mates for Threadfin Rainbowfish

• Tetras
• Rasboras (like our top selling fish, Galaxy Rasbora)
• Corydoras
• Shrimp

At The Shrimp Farm, our Threadfin Rainbowfish are carefully selected for health, color, and finnage quality. We ship safely nationwide with insulated packaging and live arrival guarantee.

Why Buy Threadfin Rainbowfish Online from The Shrimp Farm

When you order Threadfin Rainbowfish from The Shrimp Farm, you’re getting more than just fish—you’re getting quality, care, and a buying experience built for success.

• Healthy, Hand-Selected Fish
  Every Threadfin Rainbowfish is carefully inspected for health, coloration, and activity before shipping—so you receive vibrant, thriving fish ready for your aquarium.
• Shrimp-Safe & Community Ready
  Our fish are chosen with compatibility in mind, making them perfect for peaceful community tanks and shrimp setups.
• Expert Care & Husbandry
  We specialize in nano fish and freshwater species, ensuring optimal care, feeding, and conditioning before they ever reach your tank.
• Fast, Safe Shipping
  Professionally packed with insulation and temperature control to ensure your fish arrive in excellent condition.
• Live Arrival Guarantee
  Buy with confidence knowing your order is backed by our industry-leading live arrival guarantee.
• Bundle Pricing & Flexible Packs
  Save more when you buy in groups—perfect for schooling species like Threadfin Rainbowfish.
• Trusted by Hobbyists Nationwide
  The Shrimp Farm is a go-to source for freshwater fish, shrimp, and aquarium supplies across the U.S.

Backed by The Shrimp Farm's Live Arrival Guarantee!