What fish can live with Harlequin Rasbora?

Usually safer companions on this hub include Cherry Barb, Corydoras Catfish, Dwarf Gourami, Guppy, Neon Tetra. Open each pair check before you buy — the list is a shortlist, not a guarantee.

What tank mates should you avoid with Harlequin Rasbora?

Avoid Jack Dempsey, Oscar based on size, temperament, or predation risk on this profile.

What size tank do Harlequin Rasbora need for a community?

60L is realistic for a school of eight or more. Smaller tanks limit lateral schooling.

Harlequin Rasbora tank mates

Harlequin tank mates are the easy community answer when neons fight your tap water. They want a real school, peaceful midwater company, and no fin-shredding barbs. Soft or moderately hard water both work better than for cardinals. Pair with cories, small tetras, and calm gouramis; skip anything that herds or hunts 4 cm fish.

Common mistakeBuying four harlequins as a starter school is how the species earns a dull reputation. The group only develops full colour and tight schooling with roughly eight or more in settled water. Token numbers hide under plants and never look like the shop display. Budget for a real school up front, or wait.

Evidence: verified

Confidence: high

Each name below opens a pair check with Harlequin Rasbora. That check is the decision, not the list itself.

← Full Harlequin Rasbora profile·Compatibility checker·Tank builder·More barb

Usually safer companions

Conservative shortlist from this profile. Open a pair page before you buy.

Cherry Barb Pair check
The Harlequin Rasbora profile lists Cherry Barb as both safe and a recommended pairing. Cherry Barb schools in groups of 6 or more, so plan room for the whole group rather than one fish.
Corydoras Catfish Pair check
The Harlequin Rasbora profile lists Corydoras Catfish as both safe and a recommended pairing. Corydoras Catfish schools in groups of 6 or more, so plan room for the whole group rather than one fish. Corydoras Catfish swims in the bottom zone while Harlequin Rasbora stays in the middle, so the two will not crowd the same water column.
Dwarf Gourami Pair check
The Harlequin Rasbora profile lists Dwarf Gourami as both safe and a recommended pairing. Dwarf Gourami is a peaceful beginner-care species with a 60L minimum. Run the pair checker for your specific tank before stocking.
Guppy Pair check
The Harlequin Rasbora profile lists Guppy as both safe and a recommended pairing. Guppy is a peaceful beginner-care species with a 40L minimum. Run the pair checker for your specific tank before stocking.
Neon Tetra Pair check
The Harlequin Rasbora profile lists Neon Tetra as both safe and a recommended pairing. Neon Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish.

Risky or situational

May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.

Tiger Barb Open pair check
Tiger Barb is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Harlequin Rasbora. Run the pair checker before stocking.

Fish to avoid with Harlequin Rasbora

Predation, aggression, or space rules on this profile. Treat these as poor default mixes.

Jack Dempsey See why (pair)
Jack Dempsey reaches 25cm and is flagged predatory. Harlequin Rasbora at 5cm is prey-sized for it. Jack Dempsey needs at least 200L, far above the 60L minimum for Harlequin Rasbora. The tank that houses one stresses the other. Jack Dempsey is rated aggressive and Harlequin Rasbora is rated peaceful. No community-style planning carries that gap.
Oscar See why (pair)
Oscar reaches 35cm and is flagged predatory. Harlequin Rasbora at 5cm is prey-sized for it. Oscar needs at least 300L, far above the 60L minimum for Harlequin Rasbora. The tank that houses one stresses the other. Oscar is rated aggressive and Harlequin Rasbora is rated peaceful. No community-style planning carries that gap.

Tank size and groups

Published minimum for Harlequin Rasbora: 60L. Group minimum 6 (schooling).
Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
Nearest litre hub to this minimum: 60L hub.

Plan before you buy

Start a pair check with Harlequin Rasbora, or open a starter plan with the top safer companions in the builder.

Open pair checker Open this plan in builder

Tank hubs: 60L

Filtration & heating

A 60L minimum tank for Harlequin Rasbora needs a filter rated for at least 240L/hr turnover and a heater maintaining 22–27°C.

Filter size guide →Heater size guide →Tank setup checklist →Beginner plants guide →

Related (care + temperament)

Other species that list Harlequin Rasbora

Reverse lookup: these profiles reference Harlequin Rasbora under safe or “best with” lists.

Featured compatibility checks

Curated pair pages for Harlequin Rasbora. Each opens a full verdict — not just a list label.