What is the absolute minimum tank size for a Chili rasbora?

10 US gallons as an adult, no strict footprint requirement. Seriously Fish profile.

Can I keep a Chili rasbora in a smaller tank when it's a juvenile?

Briefly, yes — fish stores often sell juveniles that haven't reached adult size yet. But you should plan, buy, and cycle the adult-minimum tank from day one. Upgrading mid-life stresses the fish and is far more expensive than buying the right tank up front.

Do Chili rasbora need to be in a group?

Yes — they're schooling. A group of at least 10 together. Single or pair-only setups stress them, dull their colour, and shorten their lifespan. Plan tank size for the school, not the individual.

What temperature and pH does a Chili rasbora need?

Temperature 73–81 °F, pH 4.5–7.

Tank size · Freshwater

What size tank for a Chili rasbora? (10 gal minimum)

Chili rasbora (Boraras brigittae) — adult 0.7″, slim-bodied, schooling.

The three sizes — minimum, good, ideal

Tier	Tank size	What it gets you
Absolute minimum	10 US gal	Survives adult life. No extras — no tankmates beyond the essentials, no aquascape that eats footprint.
Good	15 US gal	Room for a small community, decor, and parameter buffering. This is where most people should aim.
Ideal	25 US gal	Natural-feeling space. Active swimmers stop pacing, schoolers school freely, aggression drops.

Parameters at a glance

Temperature: 73–81 °F
pH: 4.5–7
Adult size: 0.7″
Body type: slim

Why tank size matters for this species

Chili rasbora is a schooling species — keep at least 10 together. The tank-size minimum above assumes that group. A single or pair-only setup stresses the fish, dulls colour, and shortens lifespan.

Source for the tank-size minimum

Seriously Fish profile.

Next steps

▸ Build a candidate stocking list with the aquarium stocking calculator — it'll warn if your community is incompatible.
▸ Confirm tank water volume after substrate and rock with the aquarium volume calculator.
▸ Read the nitrogen-cycle guide before adding the first fish.