Photo: Lerdsuwa (CC BY-SA 3.0) — via Wikimedia Commons
Celestial Pearl Danio (Danio margaritatus)
Barely two centimetres long yet ablaze with pearl spots and vivid orange stripes — the celestial pearl danio packs a jewel-box's worth of colour into a nano tank.
Will it live with a Celestial Pearl Danio?
We compare each fish against your celestial pearl danio on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Assassin Snail✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Cherry Shrimp✅ CompatiblePeaceful · 3 cm · Easy care · 18–28 °C (64–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Chili Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Chili Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Crystal Red Shrimp✅ CompatiblePeaceful · 2.5 cm · Hard care · 20–24 °C (68–75 °F)
- Compatible on the things that matter: shared water near 22–24 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Crystal Red Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Dawn Tetra✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Dwarf Spotted Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Dwarf Spotted Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Ember Tetra✅ CompatiblePeaceful · 2 cm · Easy care · 24–28 °C (75–82 °F)
- Both are peaceful, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Ember Tetra in a shoal of 8+ or it gets stressed and nippy.
- Emerald Dwarf Danio✅ CompatiblePeaceful · 2 cm · Medium care · 20–24 °C (68–75 °F)
- Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Emerald Dwarf Danio in a shoal of 8+ or it gets stressed and nippy.
- Endler's Livebearer✅ CompatiblePeaceful · 3 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Endler's Livebearer in a shoal of 6+ or it gets stressed and nippy.
- Exclamation Point Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Exclamation Point Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Glowlight Danio✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Gold Ring Danio✅ CompatiblePeaceful · 3 cm · Easy care · 18–26 °C (64–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Gold Ring Danio in a shoal of 8+ or it gets stressed and nippy.
- Green Neon Tetra✅ CompatiblePeaceful · 2.5 cm · Hard care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Green Neon Tetra in a shoal of 8+ or it gets stressed and nippy.
- Hummingbird Tetra✅ CompatiblePeaceful · 1.8 cm · Hard care · 22–27 °C (72–81 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Hummingbird Tetra in a shoal of 8+ or it gets stressed and nippy.
- Lambchop Rasbora✅ CompatiblePeaceful · 3 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Lambchop Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Malaysian Trumpet Snail✅ CompatiblePeaceful · 3 cm · Easy care · 21–27 °C (70–81 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Neon Blue Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–26 °C (73–79 °F)
- Compatible on the things that matter: shared water near 23–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Neon Blue Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Green Rasbora✅ CompatiblePeaceful · 2 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Neon Green Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Nerite Snail✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Ramshorn Snail✅ CompatiblePeaceful · 2 cm · Easy care · 20–28 °C (68–82 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Red Lip Nerite Snail✅ CompatiblePeaceful · 2 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Ruby Tetra✅ CompatiblePeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Ruby Tetra in a shoal of 8+ or it gets stressed and nippy.
- Strawberry Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 23–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Strawberry Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Tucano Tetra✅ CompatiblePeaceful · 1.7 cm · Hard care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Tucano Tetra in a shoal of 10+ or it gets stressed and nippy.
- Black Darter Tetra⚠️ With cautionSemi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
- Black Darter Tetra clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Celestial Pearl Danio is small enough to tempt Black Darter Tetra; only risk it in a densely planted setup with hiding spots.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Black Ruby Barb clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Black Ruby Barb may hunt Celestial Pearl Danio, fry or shrimplets — safest in a heavily planted tank.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Black Skirt Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Black Skirt Tetra clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Black Skirt Tetra may hunt Celestial Pearl Danio, fry or shrimplets — safest in a heavily planted tank.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Skirt Tetra in a shoal of 6+ or it gets stressed and nippy.
- Chocolate Gourami⚠️ With cautionPeaceful · 5 cm · Hard care · 25–30 °C (77–86 °F)
- Different pH ranges (6.5–7.5 vs 4–6); doable if you sit in the shared band, but not ideal long-term.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Chocolate Gourami in a shoal of 6+ or it gets stressed and nippy.
- Colombian Tetra⚠️ With cautionSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Colombian Tetra clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Watch for Colombian Tetra picking off any celestial pearl danio small enough to fit in its mouth.
- Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
- Desert Goby⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
- Desert Goby clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Celestial Pearl Danio is small enough to tempt Desert Goby; only risk it in a densely planted setup with hiding spots.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Dwarf Chain Loach⚠️ With cautionPeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- GloFish Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 21–28 °C (70–82 °F)
- GloFish Tetra clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- GloFish Tetra may hunt Celestial Pearl Danio, fry or shrimplets — safest in a heavily planted tank.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep GloFish Tetra in a shoal of 6+ or it gets stressed and nippy.
- Morse Code Corydoras⚠️ With cautionPeaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Odessa Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Expect Odessa Barb to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Watch for Odessa Barb picking off any celestial pearl danio small enough to fit in its mouth.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Odessa Barb in a shoal of 6+ or it gets stressed and nippy.
- Pea Puffer⚠️ With cautionSemi-aggressive · 2.5 cm · Medium care · 24–28 °C (75–82 °F)
- Pea Puffer is semi-aggressive and may chase or nip the smaller Celestial Pearl Danio — plant heavily and break up sight lines.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Rainbow Emperor Tetra⚠️ With cautionSemi-aggressive · 3.6 cm · Medium care · 22–28 °C (72–82 °F)
- Rainbow Emperor Tetra is semi-aggressive and may chase or nip the smaller Celestial Pearl Danio — plant heavily and break up sight lines.
- Rainbow Emperor Tetra may hunt Celestial Pearl Danio, fry or shrimplets — safest in a heavily planted tank.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- Scarlet Badis⚠️ With cautionSemi-aggressive · 2 cm · Medium care · 22–27 °C (72–81 °F)
- Expect Scarlet Badis to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Serpae Tetra⚠️ With cautionSemi-aggressive · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Expect Serpae Tetra to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Watch for Serpae Tetra picking off any celestial pearl danio small enough to fit in its mouth.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Serpae Tetra in a shoal of 6+ or it gets stressed and nippy.
- Silvertip Tetra⚠️ With cautionSemi-aggressive · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Silvertip Tetra clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Celestial Pearl Danio is small enough to tempt Silvertip Tetra; only risk it in a densely planted setup with hiding spots.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Keep Silvertip Tetra in a shoal of 6+ or it gets stressed and nippy.
- Tiger Badis⚠️ With cautionSemi-aggressive · 4 cm · Medium care · 22–24 °C (72–75 °F)
- Tiger Badis clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Celestial Pearl Danio is small enough to tempt Tiger Badis; only risk it in a densely planted setup with hiding spots.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Size gap is too large (250 vs 2 cm): Alligator Gar will treat Celestial Pearl Danio as food.
- Expect Alligator Gar to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Celestial Pearl Danio is bite-sized to a 90 cm predatory clown knifefish — it will be eaten.
- Clown Knifefish is aggressive and may chase or nip the smaller Celestial Pearl Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Size gap is too large (100 vs 2 cm): Fire Eel will treat Celestial Pearl Danio as food.
- Fire Eel clearly outsizes Celestial Pearl Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Size gap is too large (90 vs 2 cm): Koi will treat Celestial Pearl Danio as food.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Celestial Pearl Danio is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
- Redtail Catfish clearly outsizes Celestial Pearl Danio and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Spotted Gar (90 cm) is big enough to swallow the 2 cm Celestial Pearl Danio whole.
- Spotted Gar clearly outsizes Celestial Pearl Danio and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Size gap is too large (300 vs 2 cm): Wels Catfish will treat Celestial Pearl Danio as food.
- Wels Catfish is aggressive and may chase or nip the smaller Celestial Pearl Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Wolf Cichlid (72 cm) is big enough to swallow the 2 cm Celestial Pearl Danio whole.
- Expect Wolf Cichlid to harass Celestial Pearl Danio at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Celestial Pearl Danio care specs
- Care level
- Medium
- Breeding
- Medium
- Max size
- 2 cm (0.8 in)
- Min tank size
- 40 L (10.6 gal)
- Temperature
- 22–26 °C (72–79 °F)
- pH
- 6.5–7.5
- Hardness
- 3–10 dGH
- Lifespan
- 3–5 years
- Diet
- Omnivore
- Swim level
- Middle
- Group size
- 6+ (shoaling)
- Family
- Cyprinidae
- Origin
- Shan State, Myanmar — shallow, heavily vegetated ponds near Hopong
What is a Celestial Pearl Danio?
The celestial pearl danio (Danio margaritatus) is a tiny freshwater fish from highland Myanmar that caused a genuine sensation when it was first described to science in 2006. Early specimens were briefly sold under the name “galaxy rasbora” — a label that stuck, and still appears today — because their iridescent pearl-spot patterning and flame-orange fin markings looked almost too vivid to be real. At a maximum size of around 2 cm (0.8 in), they rank among the most colourful nano fish available in the hobby.
Despite the “peaceful” temperament rating, this is not a passive fish. Males are highly active, constantly displaying and sparring with rival males in flicks of red and black fins. That behaviour is part of the appeal: a well-planted group tank becomes a living diorama of micro-territory and colour. What “peaceful” means in practice is that they will not harm other species, but do establish a social hierarchy among themselves that needs space and numbers to function healthily.
Where do Celestial Pearl Danios come from?
Wild celestial pearl danios are native to a very small area of Shan State in eastern Myanmar, centred on shallow, heavily vegetated ponds and pools near the town of Hopong. The habitat is cool by tropical standards — elevation plays a role — with dense aquatic and emergent vegetation, a fine substrate, soft to slightly hard water, and plenty of natural light filtering through plant cover.
The species was only described formally in 2006, which means collection pressure from the aquarium trade hit hard almost immediately. Responsible farms now produce the vast majority of specimens in the hobby, which is reassuring for conservation and usually means the fish are already adapted to typical aquarium water rather than the precise chemistry of their native pools.
What size tank does a Celestial Pearl Danio need?
The minimum is 40 litres (about 10 gallons), but this is a case where slightly larger pays dividends. A 40 L tank is workable for a group of six, but a 60–75 L (16–20 gal) setup gives the males enough territory to spread their displays without constant confrontation, and provides the surface area needed for dense planting.
Footprint matters more than height. A longer, shallower tank — the style sold as “shallow” or “iwagumi”-format aquariums — suits them better than a tall hex. Celestial pearl danios occupy the middle of the water column and spend most of their time weaving through midground plants. They are small enough that a well-sealed lid is important; they will find any gap.
Aquascape style matters for this species: dense planting with a mix of fine-leaved stem plants (hornwort, rotala, cabomba), moss-covered hardscape, and open swimming lanes between plant clusters gives them both the cover they need and the clear sightlines across which males can display.
What water parameters do Celestial Pearl Danios need?
- Temperature: 22–26 °C (72–79 °F). They prefer the cooler end of the tropical range — aim for 23–24 °C as a daily target. They are highland fish and will be stressed by tanks running above 26 °C.
- pH: 6.5–7.5, leaning neutral. They tolerate a modest range, but sharp swings cause stress.
- Hardness: 3–10 dGH, soft to moderately hard.
The single most important parameter is water quality, not chemistry. Celestial pearl danios are sensitive to elevated ammonia and nitrite, and because they are kept in smaller tanks — where waste accumulates quickly — water changes are critical. A cycled filter and weekly 20–30 % water changes are the baseline. If your tap water is moderately hard and close to neutral, you likely do not need to adjust it; just dechlorinate, match temperature, and keep the schedule.
What do Celestial Pearl Danios eat?
Celestial pearl danios are omnivores with very small mouths. Standard-sized flake must be crushed to a fine powder before feeding; otherwise fish will spit it out or ignore it. Good staple choices include:
- Finely crushed quality flake or nano pellets sized for small fish
- Micro-granules designed for nano or small-mouth species
- Frozen or live baby brine shrimp (nauplii)
- Daphnia, cyclops and micro worms
- Moina (water fleas)
Protein-rich live and frozen foods bring out the males’ colour most vividly. Feed small amounts two or three times a day — enough to be consumed within two minutes. Overfeeding in a nano tank spikes ammonia fast; underfeeding in a competitive group means subordinate fish lose condition. Watch that every fish gets access to food, particularly in a densely planted tank where food can drift into dead zones.
Are Celestial Pearl Danios peaceful — and what fish can live with them?
Celestial pearl danios are genuinely peaceful toward other species but have a lively internal social dynamic. Males display and chase each other continually; with fewer than six fish, one or two subordinates can be harassed relentlessly. Keep a minimum of six, and ten or more is better. A larger group dilutes the social tension and produces a far more natural display.
Suitable tank-mates must be small, non-aggressive, and not fast enough to outcompete celestial pearl danios for micro-foods. Good options include:
- Dwarf shrimp (Neocaridina and Caridina species) — a classic pairing; adults are rarely bothered, though shrimplets may be eaten
- Pygmy corydoras and other micro-catfish
- Ember tetras, chili rasboras and other true nano fish of a similar size
- Sparkling gouramis (with caution — monitor for any fin harassment)
Avoid any fish large enough to view a 2 cm danio as food, or fast, competitive feeders that will leave them unable to eat. For a detailed compatibility breakdown, see Celestial Pearl Danio tank mates.
How do you tell male and female Celestial Pearl Danios apart?
Sexual dimorphism is clear and one of the species’ major attractions. Males carry the signature look: a deep blue-black body densely covered in iridescent white-gold pearl spots, paired with vivid orange-red fins edged with bold black stripes on the dorsal, anal and caudal fins. In prime condition, a displaying male is unmistakably striking.
Females share the pearl-spot pattern on the body but are noticeably plumper and rounder through the belly, with much paler, less distinctly striped fins in an olive-brown to pale orange tone. The difference becomes especially obvious when a female is in breeding condition and her abdomen rounds out visibly. Both sexes are reliably identifiable once past juvenile size, usually at around 3–4 months of age.
How do Celestial Pearl Danios breed?
Breeding celestial pearl danios is achievable for an intermediate keeper and is rated medium difficulty. Unlike bubble-nest builders, they scatter eggs among fine-leaved plants or spawning mops and provide no parental care. The sequence:
- Condition a separate male and one or two females on live foods for one to two weeks.
- Set up a small breeding tank (10–20 L) with a sponge filter, spawning mops or java moss, and water matching the main tank parameters.
- Introduce the fish in the evening. Spawning typically occurs in morning light, with the male chasing the female energetically before eggs are deposited among plants.
- Remove adults after spawning; they will eat the eggs.
- Eggs hatch in two to four days at around 24 °C. Fry are very small — first foods must be infusoria or commercial fry powder, transitioning to baby brine shrimp nauplii as they grow.
A single successful spawn can yield 10–30 fry. The main challenge is feeding fry small enough foods during the first two weeks.
What are common Celestial Pearl Danio diseases?
Celestial pearl danios are not especially disease-prone in a well-maintained tank, but several conditions are worth knowing:
- Ich (white spot disease): Fine white dots on the body and fins, caused by the parasite Ichthyophthirius multifiliis. Usually introduced via new fish or plants. Preventable through quarantining all new livestock for two to four weeks.
- Velvet: A finer, dusty gold or rust-coloured sheen, especially visible under a torch. Another parasite that quarantine and good hygiene prevents.
- Fin damage / bacterial infection: Splits or pale-edged fin tissue in males can result from territorial sparring. In clean water, minor injuries heal on their own; worsening margins or red streaking suggest secondary bacterial involvement requiring attention.
- Wasting / internal parasites: Fish that eat well but lose condition and thin out may carry internal parasites — a known issue in wild-caught individuals, less common in tank-bred stock.
Prevention is straightforward: maintain water quality, quarantine new fish, avoid sudden temperature drops, and keep the group large enough that no individual is chronically harassed into immune compromise.
Health note: disease diagnosis can be difficult, and symptoms often overlap between conditions. Confirm what you are seeing against a reputable veterinary or fish-health reference before choosing a treatment approach.
How long do Celestial Pearl Danios live?
With good care, celestial pearl danios live 3–5 years. That is a solid lifespan for a fish of 2 cm, and they tend to remain vivid and active well into old age provided water quality stays high and the group remains large enough to keep the social structure healthy. Because tank-bred fish now dominate the hobby, most specimens purchased today have not been through the stress of long-distance wild collection, which was a significant mortality factor for early hobby specimens. Buy from a reputable source, maintain their specific needs — cool water, pristine conditions, a proper group size — and these tiny fish reward you with years of colour and behaviour far outsized for their scale.
Frequently asked questions
How many celestial pearl danios should I keep together?
Keep at least six, and ten or more is better. Males spar and display constantly, which is part of their appeal, but a group of six or more distributes that aggression so no single fish is bullied relentlessly. A 40–60 L planted tank gives them enough territory to spread out and show their best colours.
What do celestial pearl danios eat, and how do I feed them?
They accept most micro-foods: finely crushed flake, micro pellets, baby brine shrimp, daphnia and micro worms. Their mouths are tiny, so particle size matters — standard-sized flake must be crushed. Feed small amounts two or three times a day and they will stay in prime condition and colour.
What you need to keep a celestial pearl danio
The baseline is a heated, filtered 40 L+ tank: a reliable heater to hold 22–26 °C (72–79 °F), a gentle filter that won't batter a celestial pearl danio in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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