Threadfin Rainbow

🔥 Threadfin Rainbowfish (Iriatherina werneri)
Add delicate movement and shimmering elegance to your aquarium with the stunning Threadfin Rainbowfish. Known for their ultra-fine, flowing fin extensions and iridescent pastel tones, these peaceful nano fish bring constant motion and a soft, ethereal beauty to planted aquascapes. Small, graceful, and highly active, Threadfin Rainbowfish are perfect for aquarists looking to create a natural, lightly stocked display tank with colour and finesse.

🌿 Why Choose Threadfin Rainbowfish?
🎨 Subtle iridescent silver, gold, and blue hues with shimmering highlights
🪶 Males develop spectacular thread-like fin extensions
🐠 Peaceful schooling nano fish ideal for community aquariums
🌿 Perfect for heavily planted aquascapes and blackwater setups
⭐ Constant gentle movement adds life and flow to the tank

In a well-maintained aquarium, Threadfin Rainbowfish glide in loose shoals, flickering through plants and open water with effortless elegance.

📏 Care Requirements
🧬 Scientific Name: Iriatherina werneri
📛 Common Name: Threadfin Rainbowfish
🏠 Tank Size: 60L+ (heavily planted recommended)
📏 Adult Size: ~4–6 cm
🌡️ Temperature: 24–28°C
⚗️ pH Range: 6.0–7.5
🧘 Temperament: Peaceful
🍽️ Diet: Micro pellets, flakes, live and frozen foods (daphnia, baby brine shrimp)
👥 Group Size: 6–10+ recommended

Threadfin Rainbowfish thrive in calm, well-planted aquariums with soft water flow and plenty of vegetation for grazing and display behaviour.

🐠 Compatibility
Ideal for peaceful community aquariums. Best suited tank mates include small tetras, rasboras, Corydoras, and other gentle species. Avoid larger or aggressive fish that may outcompete or stress them.

⚠️ Important Notes
Threadfin Rainbowfish are sensitive to water quality and require stable, well-maintained conditions. Males display their best fin extension and colouration when kept in groups with a good female ratio and dense planting.

A fantastic choice for UK aquarists wanting a refined, naturalistic display fish with subtle colour and flowing movement.