Harlequin Rasbora tank mates
Easier than neons in moderately hard water. The standard pick for a first community tank where neons would struggle.
Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.
Best tank mates (on file)
Merged from conservative safest and best with fields — de-duplicated by species.
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.
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.
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.
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.
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
From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.
None on file beyond the safe list.
Fish to avoid with Harlequin Rasbora
From the unsafe list — predation, aggression, or space rules on this profile.
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.
Tiger Barb conflicts with Harlequin Rasbora on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
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.
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
Pair checks for every mix, then multi-species stocking in the builder.
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.
Similar fish (same category)
- Cherry Barb — min 60L
- Dwarf pencilfish — min 60L
- Lambchop / Espei rasbora — min 60L
- Zebra Danio — min 60L
- Golden / Beckford's pencilfish — min 80L
- Pearl Danio — min 80L
- Tiger Barb — min 80L
- White Cloud Mountain Minnow — min 40L
Related (care + temperament)
Other species that list Harlequin Rasbora
Reverse lookup: these profiles reference Harlequin Rasbora under safe or “best with” lists.