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Rasboras & Danios · Buying Guide

Chili Rasbora UK: Group, Water & Buying Guide

Chili rasboras are tiny schooling fish whose small mouths and quiet feeding need careful planning. Choose a mature planted aquarium for the whole group, check water and food access, and compare chili with strawberry rasboras before buying.

Care and buying advice
Tropical Fish Co Editorial TeamBy Tropical Fish Co Editorial TeamUpdated 18 October 20265 min read
Illustration of a chili rasbora with an elongated dark lateral marking and orange-red body among aquarium plants.
AI-assisted, reference-informed illustration of a chili rasbora. It does not identify a special colour form or show current sale stock; confirm the identity and sale unit on the individual listing.Generated illustration · biological reference: Fantomeno 14 (CC0)· Own

The quick version

  • Small size does not make a 20-litre aquarium an automatic fit. Plan group space, stable water and food access together.
  • Use a group of at least 12 as this page’s planning policy, not an experimentally established biological threshold.
  • Check exact identity and current water. Red colour, a nano label and a peaceful reputation cannot guarantee compatibility or shrimp safety.

At a glance

Scientific name
Boraras brigittae
Size record
FishBase: common length 1.8 cm SL; maximum 3.5 cm TL
Distribution
Southern Borneo, Indonesia
Water screen
FishBase: 25–28°C, pH 6.5–7.0, hardness up to 10 dH; confirm holding conditions
Aquarium planning
OATA starts at 45 L for a shoal of the smallest rasboras; assess the whole group
Group policy
At least 12 as a site planning choice, with suitable capacity
Food
Suitably small complete food; observe every fish feeding
Companions
Calm species with verified water, size and feeding overlap
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4 expert sources cited

Tiny red fish need a complete group plan

A group of chili rasboras can bring fine-scale movement to a planted aquarium. Their small mouths and quiet feeding are as relevant as their colour: they need food they can take without being crowded out.

Boraras brigittae comes from southern Borneo. FishBase records a common length of 1.8 cm standard length, excluding the tail, alongside a 3.5 cm maximum total-length record. These are different measurements; “under 2 cm” is not a safe universal adult ceiling [1].

Chili or strawberry rasbora?

Chili and strawberry are trade names for different fish. The original description of Boraras naevus distinguishes three body blotches and no continuous lateral stripe; B. brigittae has a broad, uninterrupted stripe. A photograph’s red tone alone cannot settle the identity [4].

Choose the exact species and ask what measured water it currently lives in. Similar size does not establish identical provenance, care or availability.

Care at a glance: space, water and food

Aquarium: OATA starts at 45 litres for a shoal of the smallest rasboras. This is a husbandry starting point, not a capacity guarantee. Give the group usable swimming length, planted or shaded refuge, appropriate circulation and stable filtration [3]. A tiny body does not remove the need for space or make a bare 20-litre tank a ready-made home.

Group: this page uses at least 12 as a practical planning policy. Build the aquarium around the whole group and its food access; the number is not a research-derived threshold or a promise of deep red colour. FishBase records schooling [1].

Water: FishBase compiles 25–28°C, pH 6.5–7.0 and hardness up to 10 dH. Use that as a source-labelled screen and confirm conditions for the actual fish. It is not evidence that every individual tolerates a sudden move to an endpoint [1]. Do not chase an extreme pH with acids or add botanicals solely for colour.

Feeding: use a suitably small complete food, such as a fine micro-pellet or carefully crushed appropriate food. Suitable tiny frozen or cultured foods can add variety. Check particles are actually swallowed and every fish feeds; standard-sized flakes or food taken by faster companions may leave the group hungry.

A calendar does not prove cycling

Add the group only after the filter can support the intended load and tests show suitable stable water. Check ammonia and nitrite, temperature and chemistry. “Running for a month” is not a substitute for those checks.

Tank mates: assess feeding competition first

A species aquarium can make observation and feeding easier. For a community, check adult size, predation risk, activity, temperature, chemistry and space for every group. A fixed “under 4 cm” rule cannot establish safety.

The cards below remain options to research. Shrimp and tiny shoalers may have different water requirements; some shrimp young may be eaten. A peaceful label does not guarantee that a small fish can feed undisturbed.

Use the cherry shrimp care guide and ember tetra care guide to assess those animals separately before combining them.

What if they are pale or hiding?

Check food intake, breathing and the whole group’s behaviour alongside temperature, ammonia, nitrite, pH and hardness. Light, cover, sex, age and settling can affect appearance; pale colour does not diagnose hard water. Persistent poor appetite, rapid breathing, loss of balance or visible lesions needs prompt investigation and qualified advice. If illness is suspected, ask for fish-health advice about safe separation from the group and any treatment; do not treat colour alone or improvise medicine doses [3].

Buying chili rasboras in the UK

Before ordering, confirm the exact scientific name, supplied size, stated sale unit, present availability and current holding conditions on the product page or with the seller. Ask which small foods the fish are taking. Plan the full group rather than buying a few fish because an aquarium is labelled nano.

Have the mature, tested aquarium and suitable food ready. Follow current seller guidance for the actual transport conditions; one fixed drip timer cannot make every water mismatch safe. Observe balance, breathing and feeding after introduction.

Browse rasboras & danios, nano tank fish, or the wider tropical fish range, then compare each choice with your aquarium.

Check that every chili rasbora can feed

Feeding checklist: choose suitably small food, assess faster companions and watch every fish eat.
Small food alone is not enough: check that each fish can reach and swallow it. This diagram does not prescribe a portion or approve a community.Diagram: Tropical Fish Co · Own

Related categories

Visual route into the rest of our UK live-fish range.

Rasboras & Danios

Rasboras & Danios

Rasboras, danios and White Cloud Mountain Minnows. Compare adult space, temperature and group needs, then check each individual or pack offer.

Nano Tank Fish

Nano Tank Fish

Explore smaller aquarium and paludarium possibilities. Compare exact habitat, adult space, groups and water needs; choose for your actual setup.

Fish for Planted Aquariums

Fish for Planted Aquariums

Compare fish, shrimp and other planted-setup choices. Match habitat, plant disturbance, adult space and companions; some need brackish water or land access.

Schooling Fish

Schooling Fish

Compare shoaling and group-living fish, from tetras and rasboras to cory catfish. Plan species-specific groups, adult space and feeding before ordering.

Frequently asked questions

This page uses at least 12 as a practical group policy. FishBase records schooling, but neither that record nor colour intensity establishes an exact biological minimum. Plan enough space and feeding capacity for the complete adult group.
Use OATA’s 45-litre starting point for a shoal of the smallest rasboras, then assess usable length, group size, plants, filtration, stability and companions. Their small bodies do not make every 20-litre nano suitable.
Their small mouths, feeding competition and water requirements demand care. Use a cycled aquarium with stable measured conditions and suitable small foods. A fixed number of weeks running does not prove the filter can support the intended group.
Research calm species with compatible adult size, temperature, chemistry, space and feeding needs. Avoid likely predators and fish that repeatedly outcompete or harass them. Shrimp, small fish and different swimming levels do not guarantee a safe combination.
Colour can vary with sex, age, settling, lighting, social conditions or poor health. Check breathing, appetite, behaviour and measured water. Do not diagnose hard water from colour alone or add acids and botanicals simply to make them redder.
They are different Boraras species. The original B. naevus description distinguishes its three body blotches and lack of a continuous lateral stripe from the broad stripe of B. brigittae. Trade names or colour alone are insufficient identification; ask for the exact scientific name.

Sources & further reading

Material factual claims cite the sources below; store policy and cautious inference are labelled in the article. Sources are grouped by type so you can judge their weight at a glance.

Peer-reviewed study (1)

  1. [4]
    Conway, K.W. and Kottelat, M. (2011). Boraras naevus, a new species of miniature and sexually dichromatic freshwater fish from peninsular Thailand (Ostariophysi: Cyprinidae). Zootaxa 3002(1):45–51. DOI: 10.11646/zootaxa.3002.1.4. View source

    Original species description. B. naevus has three body blotches and lacks the uninterrupted lateral stripe described for B. brigittae; not a retail photo audit.

Scientific database (1)

  1. [1]
    Froese, R. and D. Pauly (Eds.). Boraras brigittae. FishBase. View source

    Compiled size, southern Borneo distribution, schooling and environmental ranges. Common standard length and maximum total length differ.

Trade-body guidance (1)

  1. [3]
    How to look after rasboras. OATA. View source

    UK husbandry guidance: 45 L starting point for the smallest species, schooling, calm companions and feeding; species and stocking still require assessment.

Hobbyist reference (1)

  1. [2]
    Boraras brigittae (Chili/Mosquito Rasbora) profile. Seriously Fish. View source

    Supplementary husbandry reference; not proof of one universal tank size, lifespan or compatibility list.

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Tropical Fish Co Editorial Team
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Tropical Fish Co Editorial Team

Evidence-led aquarium editorial team

The Tropical Fish Co editorial team compiles care guidance from the sources cited on each page, separates published evidence from practical husbandry policy, and checks retail links against the current catalogue. First-hand experience is included only when a named contributor and the observation have been verified.

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