Giant Danio
Devario aequipinnatus
Min Tank Size
200L
Adult Size
10 cm
Lifespan
5 years
School Size
6+
About
Native to fast-moving streams and rivers across South and Southeast Asia, from India through Nepal and into Myanmar, giant danios are the big sibling in the danio family that most people don't see coming. They grow to around 10 cm in a well-maintained tank, which surprises plenty of hobbyists who picked them up as juveniles thinking they'd stay small. The body is classic danio torpedo shape, built for speed, decorated with irregular blue and gold horizontal streaks that shimmer under good lighting. They're genuinely beautiful fish when seen in a group in motion.
Water parameters are forgiving. They handle a wide pH range from 6.0 to 8.0 and don't demand soft water, though they prefer moderate hardness. Temperature around 22 to 27 Celsius suits them well. Filtration should provide decent flow since they come from moving water, and they'll use every bit of horizontal space a tank offers.
Feeding is easy: quality flake or pellet as a base, with regular treats of frozen or live daphnia, bloodworms, and similar foods to bring out their best color and condition.
Temperament is where people sometimes get caught off guard. They're not aggressive in any traditional sense, but they're boisterous, fast, and can stress out calmer fish just by existing near them. Keep a group of at least six and give them space, and much of that restless energy gets directed inward at each other in harmless chasing games.
A lid is absolutely essential. They jump, frequently, and without much warning.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Giant Danio together
Giant Danio are shoaling fish and need company of their own kind. Keep a group of at least 6. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Giant danios work well with other active, robust mid-to-upper water fish that can hold their own. Good pairings include larger barbs like tiger or rosy barbs, rainbowfish, and similarly sized danio species. They generally leave bottom dwellers like corydoras and loaches alone, making those solid choices for lower level activity. Avoid pairing them with bettas, angelfish, fancy guppies, or any species with long flowing fins since harassing or nipping those is a real possibility. Dwarf shrimp are not safe regardless of tank size. Tanks of 150 liters or more open up the compatibility options considerably by giving everyone room to avoid each other.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common mistake is underestimating tank length. A 114-liter tall tank is not the same as a long 114-liter tank for these fish, and a short footprint will produce stressed, nippy behavior fast. The second mistake is skipping a lid. Giant danios jump, and no amount of convincing yourself they won't will change that. Feed varied protein-rich foods alongside staple flake to keep them healthy and colorful. Filtration with moderate flow is appreciated, but avoid extremes. These are genuinely low-maintenance fish once the tank setup is right.
Behavior & Aggression
Giant danios aren't aggressive in a predatory way, but they're fast and persistently active, which can tip into harassment of slower or more timid species. Chasing is common within the group and rarely causes harm, but underpowered schoolmates or long-finned fish may be targeted. Fin nipping tends to show up when the group is too small, the tank is too short, or there's a particularly tempting slow-moving target nearby. A proper school of six or more in a long tank redirects most of that energy among themselves.
Things to Know
- Prolific jumpers, a tight-fitting lid is non-negotiable.
- Will eat dwarf shrimp, even large neocaridina are at risk.
- Need a long tank footprint, not just volume, for swimming room.
- Can harass smaller or slower tankmates relentlessly.
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