Threadfin Rainbow – Iriatherina werneri

Threadfin Rainbow – Iriatherina werneri

The Threadfin Rainbow (Iriatherina werneri) is a graceful, peaceful schooling fish admired for its delicate flowing fins and shimmering silver-gold body. Native to Australia and New Guinea, this small rainbowfish adds elegance and movement to planted aquariums. Males display long, thread-like extensions on their fins and show vibrant courtship colors when in groups.

These gentle fish thrive in calm, well-planted tanks with soft lighting and make an excellent addition to peaceful community setups.

• Peaceful schooling rainbowfish with elegant fins
• Males display beautiful extended dorsal and anal fins
• Ideal for planted and community aquariums
• Best kept in groups of 6 or more
• Safe with shrimp, tetras, rasboras, and other small fish

Care Guide:

• Temperature: 75–82°F
• pH: 6.0–7.5
• Hardness: Soft to moderately hard water
• Size: 1.5–2 inches
• Diet: Omnivore – micro pellets, frozen daphnia, baby brine shrimp
• Temperament: Peaceful, social

Care Tips:
✅ Keep in groups for natural schooling behavior
✅ Provide gentle water flow and dense plants for security
✅ Avoid nippy or aggressive tankmates to preserve fin health

FAQs:
Q: Are Threadfin Rainbows good for beginners?
A: They do best with intermediate care—stable water and gentle flow are key.

Q: Can they live with shrimp?
A: Yes, they’re peaceful and shrimp-safe.

Q: Do males and females look different?
A: Yes, males have longer fins and show brighter colors, especially during courtship.