Zebra danio
Danio rerio
beginner careOverview
The zebra danio (Danio rerio) is one of the toughest, most active community fish you can buy — famous stripes, tireless energy and a legendary tolerance for imperfect conditions. It is a classic first fish and even doubles as a scientific model organism. As long as you keep a proper shoal in a tank with swimming room, it is close to bomb-proof, which makes it perfect for beginners still learning the ropes.
Tank & water
Zebra danios are speed-swimmers, so length matters more than volume. Give a shoal at least 54 litres (14 gallons) and choose a long tank over a tall one.
- Temperature: unusually flexible at 18–24 °C; a heater is optional in warm rooms but useful to stop cold swings.
- Water: adaptable, pH 6.5–7.5; stable, dechlorinated water matters more than precise numbers.
- Filtration: they enjoy some current, so a normal filter flow suits them well.
- A lid: they are enthusiastic jumpers — always cover the tank.
Feeding
Zebra danios are unfussy omnivores that eat almost anything. A quality flake or micro-pellet forms the staple, with frozen and live treats — daphnia, bloodworm, brine shrimp — for variety and colour. They are fast, greedy feeders, so scatter food and take care slower tankmates get their share. Feed small amounts once or twice daily.
Tankmates
Peaceful but boisterous, zebra danios do best with other active, robust fish that can keep up: pearl danios, larger rasboras, barbs, corydoras and other fast swimmers. Avoid slow or long-finned fish such as bettas, guppies and angelfish, which may get their fins nipped.
Hardy, cheap and endlessly active, the zebra danio is one of the best fish for a first cycled community tank.
Zebra danio — frequently asked questions
Do zebra danios need a heater?
Not always. Zebra danios are unusually cool-tolerant and are happy from about 18–24 °C, so in a warm room a heater may be optional. Most keepers still fit one to prevent cold swings, but they suit an unheated tank better than most tropical fish.
Why do my zebra danios nip fins?
Usually because there are too few of them or they share the tank with slow, long-finned fish. Kept in a group of six or more they burn off energy on each other rather than tankmates. Avoid housing them with bettas, guppies or angelfish.
How many zebra danios should I keep together?
At least six, and more if space allows. They are fast, social shoaling fish that become nippy and stressed in small numbers. A larger group in a long tank spreads out their energy and looks fantastic.
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