Image of a Chili Rasbora, Boraras brigittae

Chili Rasbora

Boraras brigittae

Reviewed for accuracy · Last updated Jan 7, 2026, 1:13 AM

Tiny, very peaceful shoaling fish that thrives in soft, tannin-rich waters and remains confident in large groups.

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Key Information

Water Type

Freshwater

Temperament

Very Peaceful

Care Level

Easy

Minimum Tank Size

5 gal (20 L)

Maximum Size

1 in (1.5 cm)

Lifespan

4–6 years

Diet

Insectivore

Migration

Resident

A Great Pick for This Setup

Chili Rasbora Behavior and Compatibility

Chili Rasboras are peaceful, shoaling fish that thrive best
when kept with other small, calm species that share similar
water parameters and gentle behavior, avoiding stress or fear
caused by larger or aggressive tank inhabitants.

Ideal tank mates include other micro fish such as Ember Tetras,
Celestial Pearl Danios, and other Boraras species, which occupy
similar areas of the aquarium and do not compete aggressively
for food or territory within the tank environment.

Small, non-aggressive invertebrates like Cherry Shrimp and
Amano Shrimp can coexist well, especially in heavily planted
aquariums that provide hiding spaces and reduce predation risks
for juvenile shrimp and molting adults.

Bottom dwellers such as small Corydoras species or Otocinclus
catfish are generally safe choices, as they focus on algae and
substrate zones, minimizing interaction and competition with
Chili Rasboras in the mid-water column.

Avoid pairing Chili Rasboras with larger fish, fin nippers, or
fast swimmers like Barbs or Cichlids, as their bold behavior
and size can cause chronic stress and reduce lifespan.

Best Tank Mates for Chili Rasbora

Chili Rasbora Tank Setup and Care

They require soft acidic water. Blackwater conditions are ideal. Dense planting provides shelter. Floating plants reduce light.

They thrive in large groups. Ten or more improves confidence. Small groups increase shyness. Regular maintenance helps health.

Use very gentle filtration. Strong currents stress them. Leaf litter improves conditions. Dark substrate enhances color.

Consistency in water parameters is key. Avoid large water changes. Stable temperature prevents stress. Provide hiding spots.

Chili Rasbora Diet and Feeding

Chili Rasboras are micro-predators that naturally feed on tiny
invertebrates, zooplankton, and insect larvae found in slow,
plant-rich waters, making diet size and quality extremely
important for their health and coloration.

In aquariums, they accept high-quality micro pellets, crushed
flakes, and powdered foods designed for nano fish, provided
the particles are small enough to fit their tiny mouths.

Live and frozen foods such as baby brine shrimp, daphnia,
microworms, and cyclops are highly beneficial, enhancing both
color intensity and natural foraging behavior during feeding.

Feed small portions once or twice daily, ensuring all food is
consumed within a few minutes to prevent water quality issues
in small aquariums where waste can accumulate quickly.

A varied diet is essential, as relying on a single food source
may lead to nutritional deficiencies and reduced vitality over
time, especially in planted nano setups.

Chili Rasbora Breeding and Reproduction

Breeding Chili Rasboras is possible in aquariums, though it
requires stable water conditions, dense vegetation, and a
stress-free environment that mimics their natural habitat.

Soft, acidic water with low flow is crucial, as these fish are
egg scatterers and prefer spawning among fine-leaved plants
such as Java Moss, Subwassertang, or spawning mops.

Conditioning the adults with live foods significantly improves
spawning success, as well-fed pairs are more likely to produce
fertile eggs and engage in repeated spawning events.

Eggs are typically scattered and left unattended, meaning
parents may consume them if given the opportunity, so using
a separate breeding tank or removing adults is recommended.

Fry hatch within a few days and require infusoria or liquid
fry food initially, followed by baby brine shrimp as they grow
and develop sufficient size and swimming ability.

Chili Rasbora Water Parameters

73–82 °F (23–28 °C)
4.0–7.0
1–8 dGH
1.000–1.002 SG

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