Compatibility brief
Can Pygmy Corydoras live with Threadfin rainbowfish?
Caution. Check the issues below before buying.
Compatibility score
Profile confidence: medium
How we decideFishori checks adult size and predation risk, behaviour, water requirements and tank needs before giving a verdict.
60L
Combined minimum footprint reference for these two species: about 60L (larger active fish often want more length).
Assessment details
Compatible temperaments
Both Pygmy Corydoras and Threadfin rainbowfish share a peaceful temperament.
Narrow temperature overlap
Top issuePygmy Corydoras and Threadfin rainbowfish have only a narrow shared temperature range. Maintaining stable water temperature will be important.
“Pygmy Corydoras and Threadfin rainbowfish have only a narrow…”
Narrow temperature overlap
Next steps
Concrete changes, not "research more" filler.
- •Pygmy Corydoras should be kept in a group of at least 6 for best health and behaviour.
- •Threadfin rainbowfish should be kept in a group of at least 8 for best health and behaviour.
- Seriously Fish. Corydoras pygmaeus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Corydoras pygmaeus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Corydoras pygmaeus
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. Iriatherina werneri
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Iriatherina werneri
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Iriatherina werneri
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Try this next
Build the full stocking list with Pygmy Corydoras + Threadfin rainbowfish
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.