Photo: Lerdsuwa (CC BY-SA 3.0) — via Wikimedia Commons
Glowlight Danio (Danio choprae)
A jewel-sized shoaler with an iridescent copper-and-turquoise stripe that literally glows under aquarium lighting.
Will it live with a Glowlight Danio?
We compare each fish against your glowlight 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)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Blackwing Hatchetfish✅ CompatiblePeaceful · 3.5 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.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Blackwing Hatchetfish 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, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Clown Killifish✅ CompatiblePeaceful · 3.5 cm · Medium 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Clown Killifish in a shoal of 6+ or it gets stressed and nippy.
- Crimson Red Betta✅ CompatiblePeaceful · 3.5 cm · Hard care · 24–29 °C (75–84 °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 Glowlight Danio 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)
- Both are peaceful, and their water overlaps around 22–24 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ 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)
- 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 Glowlight Danio in a shoal of 8+ 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)
- 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Dwarf Spotted Rasbora 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)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Endler's Livebearer in a shoal of 6+ or it gets stressed and nippy.
- Eyespot Rasbora✅ CompatiblePeaceful · 3.5 cm · Medium care · 20–25 °C (68–77 °F)
- Both are peaceful, and their water overlaps around 22–25 °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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Eyespot Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Fire Red Licorice Gourami✅ CompatiblePeaceful · 3.5 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Glowlight Rasbora✅ CompatiblePeaceful · 3.5 cm · Easy 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Glowlight Rasbora 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 Glowlight Danio in a shoal of 8+ 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)
- 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Green Neon 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)
- 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 Glowlight Danio in a shoal of 8+ 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; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Neon Blue Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–26 °C (73–79 °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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Neon Blue Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Tetra✅ CompatiblePeaceful · 3 cm · Easy care · 20–26 °C (68–79 °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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Neon Tetra in a shoal of 6+ or it gets stressed and nippy.
- Northern Glowlight Danio✅ CompatiblePeaceful · 3.5 cm · Medium care · 18–24 °C (64–75 °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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Northern Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Pygmy Corydoras✅ CompatiblePeaceful · 3.2 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.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Pygmy Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Tail-spot Corydoras✅ 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.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Tail-spot Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Tailspotted Oto✅ CompatiblePeaceful · 3.5 cm · Medium 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.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Tailspotted Oto in a shoal of 6+ or it gets stressed and nippy.
- Tiger Shrimp✅ CompatiblePeaceful · 3 cm · Hard care · 20–25 °C (68–77 °F)
- Both are peaceful, and their water overlaps around 22–25 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Tiger Shrimp in a shoal of 6+ or it gets stressed and nippy.
- Trinidad Guppy✅ CompatiblePeaceful · 3 cm · Easy care · 19–24 °C (66–75 °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 Glowlight Danio in a shoal of 8+ 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 is semi-aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Keep Glowlight Danio in a shoal of 8+ 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 Glowlight Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Glowlight Danio is small enough to tempt Black Ruby Barb; only risk it in a densely planted setup with hiding spots.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ 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)
- Expect Black Skirt Tetra to harass Glowlight Danio at times; give dense cover and watch them at feeding.
- Watch for Black Skirt Tetra picking off any glowlight danio small enough to fit in its mouth.
- Keep Glowlight Danio in a shoal of 8+ 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Chocolate Gourami 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 is semi-aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Desert Goby may hunt Glowlight Danio, fry or shrimplets — safest in a heavily planted tank.
- Keep Glowlight Danio in a shoal of 8+ 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- Eastern Betta⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Eastern Betta clearly outsizes Glowlight Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Watch for Eastern Betta picking off any glowlight danio small enough to fit in its mouth.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Expect Humpbacked Tetra to harass Glowlight Danio at times; give dense cover and watch them at feeding.
- Watch for Humpbacked Tetra picking off any glowlight danio small enough to fit in its mouth.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Humpbacked Tetra in a shoal of 8+ 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Morse Code Corydoras 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 Glowlight Danio — plant heavily and break up sight lines.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Rainbow Emperor Tetra in a shoal of 8+ or it gets stressed and nippy.
- Serpae Tetra⚠️ With cautionSemi-aggressive · 4 cm · Easy care · 23–28 °C (73–82 °F)
- Serpae Tetra and Glowlight Danio are close in size, but the semi-aggressive one tends to dominate — add glowlight danio in a group to spread the pressure.
- Keep Glowlight Danio in a shoal of 8+ 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 Glowlight Danio and is semi-aggressive; risky unless the tank is big and well-planted.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Keep Silvertip Tetra in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Betta⚠️ With cautionSemi-aggressive · 5 cm · Medium care · 23–28 °C (73–82 °F)
- Spotfin Betta is semi-aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Watch for Spotfin Betta picking off any glowlight danio small enough to fit in its mouth.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Striped Red-Eye Puffer⚠️ With cautionAggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Striped Red-Eye Puffer is aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Striped Red-Eye Puffer may hunt Glowlight Danio, fry or shrimplets — safest in a heavily planted tank.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Tiger Badis⚠️ With cautionSemi-aggressive · 4 cm · Medium care · 22–24 °C (72–75 °F)
- Expect Tiger Badis to harass Glowlight Danio at times; give dense cover and watch them at feeding.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Wine Red Betta⚠️ With cautionAggressive · 5 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Wine Red Betta to harass Glowlight Danio at times; give dense cover and watch them at feeding.
- Glowlight Danio is small enough to tempt Wine Red Betta; only risk it in a densely planted setup with hiding spots.
- Keep Glowlight Danio in a shoal of 8+ 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 3 cm): Alligator Gar will treat Glowlight Danio as food.
- Alligator Gar is aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Size gap is too large (90 vs 3 cm): Clown Knifefish will treat Glowlight Danio as food.
- Clown Knifefish is aggressive and may chase or nip the smaller Glowlight 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 Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Fire Eel (100 cm) is big enough to swallow the 3 cm Glowlight Danio whole.
- Fire Eel is semi-aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Glowlight Danio is bite-sized to a 90 cm koi — it will be eaten.
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Glowlight Danio is bite-sized to a 120 cm predatory redtail catfish — it will be eaten.
- Redtail Catfish is aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Glowlight Danio is bite-sized to a 90 cm predatory spotted gar — it will be eaten.
- Spotted Gar is aggressive and may chase or nip the smaller Glowlight Danio — plant heavily and break up sight lines.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Wels Catfish (300 cm) is big enough to swallow the 3 cm Glowlight Danio whole.
- Wels Catfish clearly outsizes Glowlight Danio and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Size gap is too large (72 vs 3 cm): Wolf Cichlid will treat Glowlight Danio as food.
- Expect Wolf Cichlid to harass Glowlight 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 Glowlight Danio in a shoal of 8+ 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.
Glowlight Danio care specs
- Care level
- Easy
- Breeding
- Medium
- Max size
- 3 cm (1.2 in)
- Min tank size
- 40 L (10.6 gal)
- Temperature
- 22–26 °C (72–79 °F)
- pH
- 6.5–7.5
- Hardness
- 2–10 dGH
- Lifespan
- 3–5 years
- Diet
- Omnivore
- Swim level
- Middle
- Group size
- 8+ (shoaling)
- Family
- Danionidae
- Origin
- Myanmar — upper Irrawaddy River basin, hill streams
What is a Glowlight Danio?
The glowlight danio (Danio choprae), also sold as Chopra’s danio or the fireline danio, is a small but spectacular shoaling fish native to the hill streams of northern Myanmar. Adults rarely exceed 3 cm (1.2 in), yet the species punches well above its size in visual impact: a warm gold-and-orange body is bisected along its full length by a vivid turquoise-and-copper lateral stripe that shifts between green and blue under different angles of light. Under warm aquarium lighting the stripe appears almost self-luminous, which is exactly how the fish earned its most popular common name.
Behaviour matches the classic danio blueprint — ceaselessly active, perpetually mid-water, and strongly social. Groups of eight or more move as a coordinated, shimmering unit through the middle layer of the tank. For nano planted aquariums in particular, a shoal of glowlight danios is one of the most rewarding sights the hobby can offer, combining compact size with near-constant motion and iridescent colour.
Where do Glowlight Danios come from?
Glowlight danios are endemic to Myanmar’s upper Irrawaddy River basin, where they inhabit clear, shallow hill streams with moderate flow, sandy or gravel substrates, and abundant marginal vegetation. These waters are cool by tropical-fish standards — typically 22–26 °C (72–79 °F) — soft, and slightly acidic to neutral, with dissolved solids and hardness well below what tap water in many regions delivers.
Understanding that origin shapes every aspect of good care. Hill-stream fish are accustomed to high oxygen levels, stable parameters, and subdued natural light filtered through overhanging forest canopy. Replicating those conditions — cool, clean, well-oxygenated water and diffuse lighting — brings out their best colour and keeps stress low.
What size tank does a Glowlight Danio need?
A group of eight glowlight danios requires a minimum of 40 L (10 gal). A longer, shallower footprint is preferable to a tall tank: danios are horizontal swimmers that cover the length of the aquarium repeatedly, and a longer run gives the shoal room to form and school naturally. A 60 cm (24 in) standard aquarium at 50–60 L (13–16 gal) is a comfortable size that also accommodates fine-leaved planting without crowding.
Provide a gentle current from a sponge filter or a canister with a spray bar — enough to oxygenate the water and create light flow without battering the fish. Dense planting with species such as java moss, Rotala, Micranthemum or fine-leaved Hygrophila gives the shoal cover, breaks up reflections that can cause startle responses, and diffuses light in a way that makes the stripe truly glow. Leave open swimming space in the middle third of the tank; glowlight danios spend most of their time there.
What water parameters do Glowlight Danios need?
- Temperature: 22–26 °C (72–79 °F). This is cooler than many community tanks; avoid pairing glowlight danios with species that need 28 °C or above.
- pH: 6.5–7.5 — soft-to-neutral.
- Hardness: 2–10 dGH. Moderately soft water is ideal; very hard tap water should be cut with RO or rainwater.
Weekly water changes of 25–30 % are the single most effective care action. Glowlight danios are not delicate, but they do poorly in chronically elevated nitrates, so a cycled, established tank is essential before adding fish. Sudden swings in temperature or pH cause far more harm than mild deviation from the ideal range, so consistency matters more than chasing perfect numbers.
What do Glowlight Danios eat?
Glowlight danios are omnivores with a healthy appetite and no particular dietary fussiness. In the wild they take small invertebrates, zooplankton, and plant matter from the water column. In the aquarium, a varied diet maintains condition and keeps colouration vivid:
- Staple: high-quality micro-pellets or finely crushed flake sized for nano fish.
- Enrichment: small frozen or live foods — daphnia, baby brine shrimp, cyclops, and micro-worms. Feed two or three times weekly for best colour.
- Frequency: one or two small feeds per day; remove uneaten food within a few minutes.
Because glowlight danios feed primarily in the mid-water column, sinking wafers or bottom-dwelling foods are largely ignored. Vary the diet between dry and frozen foods rather than relying on one source.
Are Glowlight Danios peaceful — and what fish can live with them?
Glowlight danios are fully peaceful and pose no threat to any similarly sized tank-mate. Their only notable behaviour is occasional minor fin-nipping within the shoal when the group is too small — maintained at eight or more, this largely disappears. They are active but not aggressive, and they spend their time in the middle water column rather than competing for territory at the surface or bottom.
Compatible tank-mates are nano or small community species that share the same cool, soft-water conditions: ember tetras, chili rasboras, pygmy corydoras, small Microdevario or Boraras species, otocinclus, and small freshwater shrimp such as neocaridina (though the danios’ activity level may stress very small shrimp in a small tank). Avoid large or semi-aggressive fish, species that require warmer water, or any fish with long, flowing fins that may tempt the occasional nip.
For a full compatibility breakdown, see Glowlight Danio tank mates.
How do you tell male from female Glowlight Danios?
Sexual dimorphism in this species is subtle but consistent. Females are slightly larger and noticeably fuller-bodied, particularly evident when viewed from above — a rounded abdomen signals a mature female, especially when she is carrying eggs. Males are slimmer and more streamlined, and they display noticeably more intense and saturated stripe colouration: the turquoise line is brighter and the copper-gold ground colour deeper than in females of equivalent age. In a mixed-sex shoal the difference is easiest to spot when comparing several individuals side by side rather than examining one fish in isolation.
How do Glowlight Danios breed?
Glowlight danios are egg scatterers that breed readily in the aquarium, though raising fry successfully requires some preparation. Spawning is triggered by slightly raising the temperature toward the upper end of the range (24–26 °C / 75–79 °F), conditioning adults on small live and frozen foods for a week or two, and providing fine-leaved plants or a spawning mesh to protect eggs from the parents.
A small, dedicated breeding tank of 20–30 L (5–8 gal) with a thin layer of java moss or a mesh floor over a bare bottom works well. Introduce a well-conditioned pair or a group with more males than females in the evening. Spawning typically happens at first light. Eggs are small, adhesive, and scattered among plants; remove adults promptly after spawning as they will eat the eggs. At 24–25 °C the eggs hatch in 24–36 hours and the fry become free-swimming two to three days later. First foods are infusoria or commercial fry food, graduating to baby brine shrimp nauplii as the fry grow. We rate this medium difficulty — the spawning itself is straightforward, but raising fry demands attention to water quality and appropriately small food.
What diseases do Glowlight Danios commonly get?
Glowlight danios are a hardy species with no particular disease susceptibility beyond the standard freshwater community-fish concerns. The most frequent problems seen in the hobby are:
- Ich (white spot): tiny white dots on the body and fins, typically triggered by chilling or sudden temperature drops — highly relevant given this species’ cooler temperature preference and the risk of pairing them with heaters set too warm.
- Fin rot: ragged or receding fin edges, almost always a consequence of chronically poor water quality or stress from an undersized group.
- Velvet (Oodinium): a fine golden-dust appearance on the body, more common in new fish not yet settled in.
- Bacterial infections: generally secondary to injury or prolonged stress; improve water conditions first.
Prevention is straightforward: maintain the cycled tank, perform regular water changes, quarantine all new fish for two to three weeks before adding them to the display tank, and keep the shoal at eight or more to prevent chronic social stress.
Health note: disease diagnosis and medication protocols are outside the scope of a care profile. If your fish show persistent symptoms, cross-reference with a reputable veterinary or fish-health resource before treating.
How long do Glowlight Danios live?
In a well-maintained aquarium, glowlight danios typically live 3–5 years. The keys to reaching the upper end of that range are stable water conditions within the cooler 22–26 °C (72–79 °F) band, a varied diet, and a shoal large enough — at least eight individuals — that the fish remain active and unstressed throughout their lives. Wild-caught individuals occasionally appear in specialist shops and may be more sensitive initially, but tank-bred stock from reputable sources is generally robust from the outset.
Frequently asked questions
How many glowlight danios should I keep together?
At least eight, ideally ten or more. This is a tight-shoaling nano species: smaller groups become shy, lose their natural schooling behaviour, and may show fin-nipping stress. A larger shoal produces the flowing, coordinated movement that makes the fish so striking.
Are glowlight danios suitable for a planted nano tank?
Yes — they are one of the best nano-tank danios available. A 40 L (10 gal) tank planted with fine-leaved plants such as java moss, Rotala or Micranthemum suits them perfectly, providing cover, diffuse lighting that makes their stripe pop, and water conditions they thrive in.
What you need to keep a glowlight 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 glowlight danio in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
As an Amazon Associate we earn from qualifying purchases — buying through these links costs you nothing extra.
