Compatibility brief
Can Corydoras Catfish live with Harlequin Rasbora?
Often a workable match in a suitable, well-run tank. Still verify behaviour in your setup.
Compatibility score
Profile confidence: medium
Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.
60L
Combined minimum footprint reference for these two species: about 60L (larger active fish often want more length).
This is a textbook peaceful community split: harlequin rasboras hold the middle while corydoras work the substrate below. Temperament and water preferences overlap cleanly, and neither species tends to harass the other’s zone. The limits are ordinary community ones. Corydoras need a proper group of six or more on sand or smooth gravel, not sharp substrate that wears barbels. Harlequins still need their own school. Feeding time is where friction appears, when rasboras beat cories to floating food unless sinking pellets reach the bottom.
Assessment details
Known compatible pairing
Classic community staple pairing. One honest caveat: 'Corydoras' in shops spans many species with different temperature bands — confirm which cory you are buying, then this pairing is as safe as community fishkeeping gets.
Compatible temperaments
Both Corydoras Catfish and Harlequin Rasbora share a peaceful temperament.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
Data or identification limits
Top issueAt least one fish has common trade or ID ambiguity, so the numbers here may not match the individual in the shop.
“At least one fish has common trade or ID ambiguity, so the…”
Data or identification limits
Next steps
Concrete changes, not "research more" filler.
- •Keep six or more cories on soft substrate with six or more harlequins above, and feed sinking wafers after the midwater flake so bottom fish are not shut out.
- •Corydoras Catfish should be kept in a group of at least 6 for best health and behaviour.
- •Harlequin Rasbora should be kept in a group of at least 6 for best health and behaviour.
- Seriously Fish. Corydoras paleatus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Corydoras paleatus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Corydoras paleatus
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Seriously Fish. Trigonostigma heteromorpha
Supports: aquarium size, water chemistry, temperament and compatibility (primary care reference).
- FishBase. Trigonostigma heteromorpha
Supports: taxonomy and wild maximum size — translate to tank stocking, not a target number.
- Wikipedia. Trigonostigma heteromorpha
Supports: general species background and common-name orientation only.
Try this next
Build the full stocking list with Corydoras Catfish + Harlequin Rasbora
Plan further
Check each species’ mates list, size the glass, then verify the full stock in the builder. Methodology explains how verdicts are produced.
Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.
Profile data confidence: high. Checked against several solid care sources that mostly agree. At least one species here has common trade-name ambiguity.