Threadfin Rainbowfish Medium Large
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🐟 Threadfin Rainbowfish Care Sheet
🔹 Overview
| Category | Details |
|---|---|
| Scientific Name | Iriatherina werneri |
| Common Name | Threadfin Rainbowfish |
| Origin | Papua New Guinea, Northern Australia |
| Adult Size | 4–5 cm (1.5–2 in) |
| Lifespan | 3–5 years |
| Temperament | Peaceful, schooling |
| Tank Level | Mid to upper |
🔹 Tank Setup
| Parameter | Ideal Range |
|---|---|
| Tank Size | 40+ liters (10+ gallons) for a small group |
| Temperature | 24–28 °C (75–82 °F) |
| pH | 6.5–7.5 |
| Hardness | Soft to moderately hard (4–12 dGH) |
| Substrate | Sand or fine gravel |
| Decor | Fine-leaved plants, floating plants, driftwood |
| Lighting | Low to moderate |
| Filtration | Gentle flow; sponge filter recommended |
Tips:
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Keep in schools of at least 6–8 to display natural behavior.
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Provide plenty of plants for cover and security.
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Gentle water movement mimics natural stream habitats.
🔹 Diet
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Type: Omnivorous / micropredator
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Best Foods: Micro-pellets, finely crushed flakes, live/frozen foods (daphnia, baby brine shrimp, microworms).
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Feeding Frequency: 1–2 times daily; feed small amounts to prevent overfeeding.
🔹 Behavior & Compatibility
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Peaceful and shy; males display long, delicate fins when mature.
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Mid- to upper-level swimmers; enjoy planted aquariums with open swimming lanes.
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Best kept with other small, non-aggressive fish.
🧭 Tank Mate Guide
✅ Compatible Species
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Small tetras (neon, ember)
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Rasboras (chili, harlequin)
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Pygmy Corydoras
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Other small, peaceful rainbowfish
⚠️ Avoid or Use Caution With
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Larger or aggressive fish
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Fin-nippers (barbs, aggressive tetras)
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Fast-moving fish that stress them
🐣 Breeding Info
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Spawning Method: Egg scatterers; use fine-leaved plants or spawning mops.
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Parental Care: None; adults may eat eggs.
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Fry Care: Feed infusoria or microworms first, then baby brine shrimp or crushed flakes.
🌿 Fun Facts
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Named for its thread-like fins in males, which are long and elegant.
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Extremely delicate and peaceful, ideal for planted nano or community tanks.
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Shows off best in small, calm groups in well-planted aquariums.
