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The Galaxy Rasbora, more accurately known as the Celestial Pearl Danio (Danio margaritatus), is a small, stunning freshwater fish famous for its galaxy-like coloration. With shimmering spots and bright orange fins, it's a favorite in nano aquariums and planted tanks.
🐟 Overview
| Feature | Details |
|---|---|
| Common Name | Galaxy Rasbora, Celestial Pearl Danio (CPD) |
| Scientific Name | Danio margaritatus |
| Family | Cyprinidae (carps and minnows) |
| Origin | Myanmar (Lake Inle region) |
| Discovered | 2006 (a very recent aquarium addition) |
| Type | Small, peaceful schooling fish |
| Lifespan | 3–5 years |
| Size | 0.8–1 inch (2–2.5 cm) |
| Conservation | Previously overfished; now mostly captive-bred |
🌌 Appearance
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Body Color: Iridescent dark blue to greenish-black
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Spots: Creamy-white or gold, resembling stars on a night sky (hence "galaxy")
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Fins: Males have bright orange-red fins with black edging; females are paler
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Sex Differences:
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Males: Slimmer, more colorful with vivid fin markings
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Females: Rounder belly, duller coloration
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🧬 Behavior & Temperament
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Temperament: Peaceful but shy
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Social Structure: Schooling – best kept in groups of 6–10+
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Tank Level: Mid to lower swimmers
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Male Behavior: Mild territorial displays; males flare fins and “dance” during courtship
🏠 Tank Requirements
| Parameter | Ideal Range |
|---|---|
| Tank Size | Minimum 10 gallons for a group |
| School Size | 6 or more (10+ better for natural behavior) |
| Water Temperature | 72–78°F (22–26°C) |
| pH Range | 6.5–7.5 |
| Water Hardness | Soft to moderately hard (3–12 dGH) |
| Filtration | Gentle flow; sponge or low-flow filter |
| Substrate | Dark substrate enhances colors |
| Décor | Dense plants, moss, driftwood, hiding spots |
| Lighting | Moderate to low (reduces stress and enhances color) |
These fish are sensitive to water changes and poor water quality—stable parameters are key.
🍽️ Diet
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Type: Omnivore (micro-predator in nature)
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Best Foods:
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High-quality micro pellets or nano flakes
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Frozen/live: baby brine shrimp, daphnia, microworms, grindal worms
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Occasional vegetable matter: spirulina flakes, crushed algae wafers
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Feed small portions 1–2 times daily. A varied diet enhances color and breeding behavior.
🤝 Tankmates
| Compatible Tankmates | Avoid |
|---|---|
| Small rasboras, chili rasboras | Large or aggressive fish (e.g. cichlids) |
| Corydoras catfish (especially pygmy types) | Fast, boisterous fish |
| Shrimp (e.g. cherry, amano) | Betta (may attack or be attacked) |
| Otocinclus catfish | Anything that could see them as food |
CPDs thrive in peaceful community tanks with soft water and gentle companions.
❤️ Health & Lifespan
| Common Issues | Prevention/Treatment |
|---|---|
| Stress from shipping | Buy from local breeders or reputable sources |
| Ich (white spots) | Quarantine new fish; raise temperature & treat |
| Fin rot | Clean water and avoid nippy tankmates |
| Bloating | Avoid overfeeding; include fiber in diet |
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Lifespan: 3–5 years with proper care
🥚 Breeding
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Breeding Type: Egg scatterers
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Breeding Behavior:
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Males court females with fin-flaring displays
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Females scatter eggs over fine-leaved plants or moss
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Spawning Tips:
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Use a separate breeding tank (5–10 gallons)
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Add Java moss or spawning mops
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Keep 1–2 males with 2–3 females
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Egg & Fry Care:
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Adults may eat eggs—remove parents post-spawning
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Eggs hatch in ~3 days; fry swim freely after 2–3 more
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Feed fry infusoria or powdered food, then baby brine shrimp
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CPDs breed readily in aquariums but fry are tiny and delicate.
✅ Pros & Cons
| Pros | Cons |
|---|---|
| Stunning coloration and peaceful behavior | Shy and easily stressed |
| Great for nano tanks and planted setups | Not suitable with large or boisterous fish |
| Easy to breed in captivity | Fry require specific care and feeding |
| Compatible with shrimp | Sensitive to unstable water conditions |
📌 Quick Summary
| Trait | Info |
|---|---|
| Size | ~1 inch (2.5 cm) |
| Lifespan | 3–5 years |
| Tank Size | 10 gallons minimum |
| Temperature | 72–78°F (22–26°C) |
| Behavior | Peaceful, shy, schooler |
| Breeding | Easy to breed, egg scatterers |
| Best Setup | Planted, low-flow nano aquarium |
🌱 Ideal Tank Setup
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Tank: 10–20 gallons
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Substrate: Dark gravel or sand
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Plants: Java moss, Anubias, Rotala, Pogostemon
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Filtration: Sponge filter or gentle HOB
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Light: Low to moderate (subdued)
IMAGES ARE FOR REPRESENTATIVE PURPOSES ONLY.
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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.
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