Should I buy it?
Giant danio
Devario malabaricus
Also known as: malabar danio, devario aequipinnatus (often traded as giant danio)
An 11 cm fast schooling danio that needs real swim space. Beautiful in a large group in a long tank, and disruptive and stressful in anything under 150 cm.
Giant danio tank mates · 200L tank size hub
peaceful · intermediate care
Sources & confidencehigh · partially verified · beginner: caution
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Large community tanks 200L or more with a school of eight and robust mid-size companions.
Avoid if: Your tank is under 120 cm long, you keep nano fish, or you want a calm aquarium.
Common mistakeAdding giant danios to a 90L tetra community because they looked like big zebra danios is how keepers invent chronic stress for every fish under 5 cm. Constant high-speed motion needs length and robust neighbours — not a short community kit with neon dither.
Top things that go wrong
- Mouth gap vs tiny tank mates. May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
- Group welfare — not a solo display fish. Plan at least **6** together for normal behaviour; smaller groups often mean stress, colour loss, or nipping depending on species.
- Shrimp & snails. Not shrimp-safe — adults, fry, or both get eaten.
What most shops don't tell you
- 1.Myth: giant danios are just bigger zebra danios for any peaceful community kit. Reality: they need serious length and robust company — a 90L tetra tank turns their pace into a stress machine for every smaller fish in the glass.
- 2.Predation risk scales with gape, night feeding, and crowding. 'They grew up together' is a schedule, not a law.
- 3.Classed peaceful for similar-sized community use. Still a bite-sized risk toward fry or very small community fish in small volumes.
- 4.Sold in tiny tanks as 'hardy danios' without planning for 25 to 30 cm or more of horizontal swim space for the group.
- 5.Mixed with slow long-finned fish in narrow tanks with poor swim-through routes.
- 6.Plan for 180 to 240 litres or more for an adult group. Secure lid. Feed varied foods and do not overstock the surface, or feeding frenzies turn into crashes.
About this species
Giant danios are 10 to 12 cm Indian cyprinids that need a long tank and a fast school. Peaceful with mid-sized community fish, but size plus food competition makes them unsafe with tiny nanofish long-term.
- Rainbow / red-tailed black shark200L min · same group, comparable tank size
- Rosy Barb180L min · same group, comparable tank size
- Denison's / red-line torpedo barb250L min · same group, similar adult size
- Scissortail Rasbora150L min · same fish family
- Gold / Chinese barb120L min · same fish family
- Odessa Barb120L min · same group, similar adult size
- Banded leporinus300L min · same fish family
- Black ruby barb100L min · same fish family
- African freshwater butterflyfishalso intermediate peaceful, similar tank size
- Black ruby barbalso intermediate peaceful, similar tank size
- Boesemani Rainbowfishalso intermediate peaceful, similar tank size
- Bolivian Ramalso intermediate peaceful, similar tank size
- Brown / hockey-stick pencilfishalso intermediate peaceful, similar tank size
- Checkerboard cichlidalso intermediate peaceful, similar tank size
- African freshwater butterflyfish tank matesnames this fish as a conditional pairing — read the pair page conditions
- Bala / silver shark tank mateslists this fish as a safe and recommended mate
- Banded leporinus tank matesnames this fish as a conditional pairing — read the pair page conditions
- Black ghost knifefish tank matesnames this fish as a conditional pairing — read the pair page conditions
- Denison's / red-line torpedo barb tank mateslists this fish as a safe and recommended mate
- Pictus catfish tank mateslists this fish as a safe and recommended mate
- Rainbow / red-tailed black shark tank matesnames this fish as a conditional pairing — read the pair page conditions
- Ropefish / reed fish tank matesnames this fish as a conditional pairing — read the pair page conditions
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease32
- Peacefulness76
- Community fit66
- Small-tank fit90
- Hardiness54
- Energy86
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 200L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Bala / silver shark, Denison's / red-line torpedo barb.
Prioritise 6+ of Giant danio in 200L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Giant danio
Usually safer (engine GOOD): Bala / silver shark, Denison's / red-line torpedo barb. Conditional (CAUTION — read the pair page before buying): Betta, Boesemani Rainbowfish, Chili Rasbora, Corydoras Catfish, Dwarf Gourami. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
None listed. Use the pair checker before mixing.
Compare with
Run a real pair check: Giant danio + Bala / silver shark
Behaviour and temperament
Giant danios are peaceful toward similar-sized active fish and overwhelming toward tiny dither by sheer speed and traffic. They school and stay calmer in a proper group of six or more. The damage they do is usually to stocking plans, not to a spite chart.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
Territory: Not strongly territorial, but still needs room so its working space does not overlap the next fish.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- A group of six or more patrols open midwater and top water in a long tank.
- Constant swimming is normal; a lone giant danio often paces and looks stressed.
- Pacing in a short community tank means the footprint failed months before adult length.
- Tiny tetras hiding all day means neighbour choice failed — not picky appetite.
- Low listed malice; speed and size still make nano neighbours miserable.
- In-school sorting looks rough and is still better than a lone giant in a nano.
- Rehome nano fish before you add more danios to ‘calm the school.’
- Move giant danios out of any tank that cannot give ~200L-class length.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium
Diet
omnivore
Giant danios are active omnivores that clear midwater food in seconds. Quality flake or pellets plus frozen foods a few times a week matter; a nano tetra pinch leaves them scavenging. Feed a group evenly so the largest fish does not monopolise every meal in a long 200L-class footprint.
Shrimp & snails
Not shrimp-safe — adults, fry, or both get eaten.
Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- Hold 18 to 26 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6 to 7.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Schooling species. Buy 6 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 200L published minimum for adults.
- You can stock at least 6 individuals (group welfare).
- Heater can hold 18–26°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
- No tank mates small enough to fit the adult mouth gap for this species.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 200L minimum tank needs a filter rated for at least 800L/hr turnover and a heater to hold 18–26°C reliably.
Plant suggestions
Giant danio does well in planted tanks. Plants compatible with 18–26°C and pH 6–7.5:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Devario malabaricus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Devario malabaricus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Devario malabaricus
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Common questions about Giant danio
- How big do Giant danio get?
- Giant danio adults run about 10–12 cm. In home tanks they usually land near 11 cm — plan space and filtration for that, not the juvenile in the shop bag.
- What size tank does Giant danio need?
- 200L is the planning floor for adult swimming space and bioload. A 240L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Giant danio aggressive?
- Giant danios are peaceful toward similar-sized active fish and overwhelming toward tiny dither by sheer speed and traffic. They school and stay calmer in a proper group of six or more. The damage they do is usually to stocking plans, not to a spite chart.
- Do Giant danio need to be kept in a group?
- Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Giant danio?
- Adding giant danios to a 90L tetra community because they looked like big zebra danios is how keepers invent chronic stress for every fish under 5 cm. Constant high-speed motion needs length and robust neighbours — not a short community kit with neon dither.
- What fish can live with Giant danio?
- The Giant danio profile lists Bala / silver shark, Denison's / red-line torpedo barb among its safer pairings (engine-checked GOOD). Betta, Boesemani Rainbowfish, Chili Rasbora, Corydoras Catfish are conditional (CAUTION): workable only with the specific conditions on each pair page. Run the pair checker for your exact water and tank size before stocking.