Zebra Danio
Danio rerio
Min Tank Size
75L
Adult Size
5.1 cm
Lifespan
4 years
School Size
6+
About
Native to the rice paddies, streams, and rivers of South and Southeast Asia, zebra danios are one of the most reliably hardy fish in the hobby. Those bold horizontal blue and gold stripes paired with near-constant motion make them impossible to miss in a tank, and their resilience across a wide range of conditions means they forgive beginner mistakes that would kill more sensitive species.
They tolerate temperatures from the high teens into the upper 20s Celsius, making them unusually adaptable even by community fish standards. Water chemistry flexibility is just as impressive, thriving from soft acidic water to moderately hard and alkaline. They're omnivores that will eat virtually anything offered, from basic flake food to frozen daphnia or baby brine shrimp, and they don't need a complicated feeding routine to stay healthy.
These fish are genuinely active all day long, so they add a sense of energy to any tank they're in. Keep at least six together or the group can get a bit scrappy among themselves. A tightly fitting lid is non-negotiable since they're notorious jumpers.
The leopard danio variant has a spotted pattern instead of stripes but is the same species behaviorally, and GloFish danios are genetically modified versions available in vivid fluorescent colors, all sharing the same care requirements. If you want to see how other hobbyists have set up tanks for zebra danios, browsing community builds is a great way to get inspiration for aquascaping and tankmate combinations that actually work.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Zebra Danio together
Zebra 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
Zebra danios work well with a broad range of community fish. Corydoras are a classic pairing since the danios occupy upper and mid zones while the corys work the bottom, and neither bothers the other. Other active schooling fish like rasboras, cherry barbs, or other danio species also make solid matches. Avoid pairing them with very slow or delicate-finned fish like bettas, fancy guppies, or adult angelfish where fin nipping becomes a real risk. They can coexist with dwarf shrimp in some tanks, but fast-moving danios may stress smaller shrimp colonies, and juveniles or very small shrimp can occasionally end up as snacks.
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 keeping too few. A group of three or four becomes restless and sometimes aggressive, while a proper school of six or more settles into natural schooling behavior. Beginners also underestimate their speed and jumping ability. Without a lid, losses are almost inevitable. Tank length matters more than volume here since these fish need horizontal space to sprint, and a tall narrow tank of the same liters will leave them cramped. Diet variety helps maintain color and vitality, so rotating between flake, frozen, and live foods goes a long way even with a fish this easy.
Behavior & Aggression
Zebra danios are generally peaceful but not entirely without edge. In smaller groups or cramped tanks, they can establish a loose pecking order through chasing, and that energy sometimes spills over toward tankmates. The real issue is fin nipping. It's not guaranteed, but slow-moving or long-finned fish like bettas, fancy guppies, or angelfish can attract attention from a hyperactive danio school. Larger schools of six or more tend to keep that nipping behavior directed inward, reducing but not eliminating the risk entirely.
Things to Know
- Extremely fast swimmers, need horizontal swimming space more than tank height
- Known jumpers, a tight-fitting lid is essential
- May nip fins of slow or long-finned tankmates like bettas or angels
- GloFish danios are the same species and have identical care requirements
Community Sightings
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