Tiger barb

Quick facts

Adult size

7 cm

Lifespan

can live up to 6 years

Tank zone

mid

Temperament

semi-aggressive

Difficulty

beginner

Schooling

recommended 8+ (critical minimum 5, thrives at 12+)

Water parameters

Temperature

22–28°C

pH

6.0 to 7.5

Hardness

2 to 15 dGH

Tank requirements

Minimum volume

110 L

Minimum length

75 cm

Flow

low

Lighting

dim preferred

Substrate

any

Open swimming room

needed

Feeding

Diet: omnivore, feeds primarily at the mid.

Greedy omnivore that eats anything offered. Flake food, pellets, frozen bloodworm, frozen brine shrimp, live daphnia, blanched peas, blanched zucchini. They rush the surface at feeding time and eat fast. In community tanks, slower species struggle to get food when tiger barbs are present. Feed at multiple spots or use a mix of floating and sinking food so bottom-dwellers get a share. Twice-daily feeding keeps aggression lower than once-daily; well-fed tiger barbs nip less. Color quality improves with a varied diet that includes frozen and live food alongside dry staples.

Compatibility

• Notorious fin-nipper. Tiger barbs harass anything with long flowing fins: bettas, angelfish, fancy guppies, pearl gouramis, and long-finned tetras. This is the single most common compatibility mistake in the hobby and the source of a thousand "my tiger barbs killed my betta" forum posts.
• Keeping tiger barbs in groups of 8+ reduces nipping of tankmates significantly. In small groups (under 6), they redirect aggression outward. In large groups, they establish an internal pecking order and spend most of their energy on each other. The nipping doesn't disappear but it becomes tolerable for robust, short-finned tankmates.
• Good tankmates: other barbs (cherry, rosy, gold), larger tetras (black skirt, buenos aires), rainbow fish, loaches, and catfish. Anything fast, short-finned, and not delicate.
• Active schooling fish that dominate the middle of the tank. In a well-stocked community, they're a constant source of motion. They're the fish you see when you look at the tank; everything else orbits around them.

Habitat

Native to the Malay Peninsula, Sumatra, and Borneo, in forest streams and rivers with clear to slightly tannin-stained water, moderate flow, and sandy or rocky bottoms. Also found in disturbed habitats like irrigation ditches and reservoir margins. Wild populations are in decline in parts of Sumatra due to habitat destruction, but the species is in no danger of disappearing from the hobby: it's been bred commercially in enormous quantities since the 1930s and is one of the cheapest tropical fish available. The orange body with four vertical black bars is unmistakable. Numerous color variants have been line-bred: green (dark body, reduced bars), albino (pale body, bars still visible), and GloFish (fluorescent, genetically modified, restricted in some countries). Males are more intensely colored than females, with red-edged fins and a deeper orange body. Females are paler and rounder when full of eggs. Tiger barbs have been a staple of the aquarium trade for nearly a century and remain one of the most widely sold freshwater fish in the world.

Breeding

Egg scatterer that breeds easily in captivity. Condition a group with high-quality frozen food for a week, then move a plump female and a colorful male to a breeding tank with fine-leaved plants or spawning mops. Temperature at 26–27°C. Spawning happens at dawn; the pair scatters 200-300 eggs among the plants. The eggs are adhesive and settle on leaves and the substrate. Adults eat eggs immediately, so remove them right after spawning. Eggs hatch in 36-48 hours. Fry are free-swimming in another 3-4 days and need baby brine shrimp or microworms as first food. Growth is fast; juvenile bars appear within 3-4 weeks. Commercial breeders produce millions of tiger barbs annually using mass spawning in outdoor ponds and indoor raceways. The species responds well to hormone-induced spawning in commercial settings. Home breeding is a good beginner project because the fish are robust and prolific.

Common problems

Fin nipping is the defining behavioral problem (detailed above). Beyond that, tiger barbs are tough. Ich is the most common disease, usually appearing in newly purchased fish that were stressed during transport. Standard ich treatment (elevated temperature to 30°C or malachite green) works. Tiger barbs tolerate a range of medications without complications. Obesity is easy to induce because they eat relentlessly; an overfed tiger barb becomes barrel-shaped and lethargic. Feed a controlled amount rather than letting them gorge. Internal parasites (tapeworm, roundworm) occasionally appear in farm-raised batches, showing as progressive weight loss despite eating. Treat with praziquantel or levamisole. Color loss in tiger barbs is almost always environmental: poor diet, stress from small group size, or washed-out lighting. A group of 10+ well-fed tiger barbs under warm lighting are strikingly colorful. The same fish in a group of 3 under harsh white light look like different animals.

Bioload

Bioload coefficient: 2.0 (active stocky barb; higher per-cm load than slim tetras due to constant swimming).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size