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Here is a complete care guide and detailed profile for the Least Rasbora – a tiny, peaceful, and beautiful nano fish perfect for planted aquariums and nano tanks.
🐟 Least Rasbora – Full Details & Care Guide
✅ Common Names:
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Least Rasbora
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Exclamation Point Rasbora
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Dwarf Rasbora
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Rasbora Uropthalmoides (older reference)
🔬 Scientific Classification:
| Category | Detail |
|---|---|
| Scientific Name | Boraras urophthalmoides |
| Family | Cyprinidae |
| Order | Cypriniformes |
| Origin | Southeast Asia (Thailand, Cambodia, Malaysia) |
🎨 Appearance:
| Feature | Description |
|---|---|
| Body Color | Transparent to light amber with a dark midline stripe and a black dot near the tail (resembles an exclamation mark) |
| Size | 1.5 – 2 cm (0.6 – 0.8 inches) |
| Lifespan | 3 – 5 years with good care |
| Sexual Dimorphism | Males are slightly slimmer and more colorful; females are rounder |
⚠️ One of the smallest aquarium fish species in the hobby!
🌡️ Water Parameters:
| Parameter | Ideal Range |
|---|---|
| Temperature | 22 – 28°C (72 – 82°F) |
| pH Level | 5.5 – 7.0 |
| Hardness | 1 – 8 dGH |
| Water Type | Freshwater (soft, slightly acidic preferred) |
🏡 Tank Setup:
| Feature | Recommendation |
|---|---|
| Tank Size | Minimum 5 gallons (nano tank friendly) |
| Group Size | At least 8–10 (best in large groups) |
| Substrate | Dark sand or fine gravel |
| Plants | Dense live plants (Java moss, Rotala, floating plants) |
| Decorations | Leaf litter, driftwood for blackwater effect |
| Lighting | Low to moderate (brings out colors) |
| Filtration | Sponge filter or nano HOB filter with gentle flow |
| Cover | Yes – they are small and can jump |
🧬 Temperament & Behavior:
| Trait | Description |
|---|---|
| Temperament | Extremely peaceful |
| Schooling | Yes, tightly schooling |
| Swimming Zone | Mid to top levels |
| Compatibility | Great for peaceful nano tanks |
| Activity Level | Active and graceful |
🍽️ Feeding:
| Food Type | Examples |
|---|---|
| Staple Diet | High-quality micro pellets, crushed flakes |
| Live/Frozen | Baby brine shrimp, micro worms, daphnia |
| Freeze-Dried | Bloodworms (chopped), tubifex (fine) |
| Feeding Frequency | 2–3 times daily in small portions |
🐛 Tiny mouths need micro-sized food – avoid large flakes or pellets.
🐣 Breeding Least Rasboras:
| Breeding Type | Description |
|---|---|
| Spawning Method | Egg scatterers |
| Breeding Tank | Separate with moss, fine-leaved plants |
| Spawning Behavior | Males chase females and scatter eggs |
| Parental Care | None – adults eat eggs |
| Hatching Time | 24–36 hours |
| Fry Food | Infusoria, then baby brine shrimp |
🌱 Use Indian almond leaves or soft moss for egg laying and tannin-rich water.
🤝 Ideal Tank Mates:
| ✅ Compatible Tank Mates | ❌ Avoid These |
|---|---|
| Chili Rasboras | Larger or aggressive fish |
| Ember Tetras | Fast, boisterous fish |
| Dwarf Shrimp (Amano, Neocaridina) | Cichlids or Gouramis |
| Celestial Pearl Danios | Bettas (can mistake them for food) |
| Pygmy Corydoras | Fish that may eat them due to size |
🧼 Care & Maintenance Tips:
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💧 Weekly water changes (20–30%)
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✅ Stable soft water conditions
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🧪 Use a sponge filter to avoid sucking up tiny fish
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🌿 Densely planted tanks help them feel secure
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🛑 Avoid sudden temperature shifts
🧾 Quick Profile Summary:
| Feature | Detail |
|---|---|
| Scientific Name | Boraras urophthalmoides |
| Common Name | Least Rasbora |
| Size | 1.5 – 2 cm |
| Lifespan | 3 – 5 years |
| Temperament | Very peaceful |
| Tank Size | 5+ gallons |
| Group Size | 8–10 minimum |
| Swimming Zone | Mid – Top |
| Diet | Micro-predator / Omnivore |
| Care Level | Intermediate |
| Breeding | Egg-scattering, no parental care |
🌟 Highlights:
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🧡 One of the smallest aquarium fish species
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👥 Thrives in dense schools – adds life to nano tanks
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🌿 Perfect for planted and blackwater aquariums
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🐠 Peaceful and shrimp-safe (due to small size)
IMAGES ARE FOR REPRESENTATIVE PURPOSES ONLY.
We process orders on all weekdays (Monday to Saturday), excluding public holidays.
To avail free shipping, purchase amount should be Rs350/-(for Aquarium Accessories and Aquatic Plants) or more, less than the above amount shipping charges applicable Rs70/- only. For live fish delivery charges applicable at the time of checkout.
Orders are normally Shipped within 1-2 days and usually take 2-5 working days to be delivered based on your location. However, you will receive an approximate timeline when you place your order.
To ensure that your order reaches you quickly and in good condition, we only ship through reputed courier agencies.
To avail free shipping, purchase amount should be Rs350/-(for Aquarium Accessories and Aquatic Plants) or more, less than the above amount shipping charges applicable Rs70/- only. For live fish delivery charges applicable at the time of checkout.
Orders are normally Shipped within 1-2 days and usually take 2-5 working days to be delivered based on your location. However, you will receive an approximate timeline when you place your order.
To ensure that your order reaches you quickly and in good condition, we only ship through reputed courier agencies.
