5 Threadfin Rainbowfish

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Threadfin Rainbowfish (Iriatherina werneri)A delicate, elegant freshwater rainbowfish famous for its long, flowing fin filaments and shimmering silver-blue body. One of the most gr aceful nano-to-medium community fish when kept properly.• Common Name: Threadfin Rainbowfish• Scientific Name: Iriatherina werneri• Adult Ask for Size: ~1.5–2 inches• Temperament: Peaceful, shy, non-aggressive• Schooling: Yes — keep 6–8+ (more females than males is ideal)• Tank Ask for Size: 20+ gallons• Water Temp: 75–82°F• pH: 6.0–7.5• Hardness: Soft to moderately hard• Diet: Omnivore• Micro-pellets, finely crushed flakes• Frozen/live foods (baby brine shrimp, daphnia)• Lifespan: 3–5 yearsImportant Notes:• Males have dramatic thread-like fin extensions; females are smaller and plainer.• Needs calm water—strong flow will damage fins and stress them.• Best in planted tanks with gentle filtration and subdued lighting.• Avoid fin nippers (barbs, aggressive tetras).• Excellent tankmates: small rasboras, peaceful tetras, Corydoras, shrimp. Show more