Compatibility brief
Can Betta live with Rosy Tetra?
Caution. Check the issues below before buying.
Compatibility score
Profile confidence: low
How we decideFishori checks adult size and predation risk, behaviour, water requirements and tank needs before giving a verdict.
80L
Combined minimum footprint reference for these two species: about 80L (larger active fish often want more length).
Rosy Tetra is a fin nipper and Betta is vulnerable to nipping — long fins are a common target even when water parameters match.
Assessment details
Temperament difference
Top issueBetta is semi-aggressive, while Rosy Tetra is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely.
Fin nipping risk
Rosy Tetra is a known fin nipper and Betta has long, flowing fins. Rosy Tetra will likely harass Betta.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Betta is semi-aggressive, while Rosy Tetra is peaceful”
Temperament difference
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so Rosy Tetra can escape if harassed.
- •Avoid keeping Rosy Tetra with long-finned fish like Betta.
- •Rosy Tetra should be kept in a group of at least 6 for best health and behaviour.
- Seriously Fish. Betta splendens
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Betta splendens
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Betta splendens
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. Hyphessobrycon rosaceus
Primary: species page covering Amazon range, soft-water requirement, and the sickle-fin dimorphism in adult males.
- Practical Fishkeeping. Rosy Tetra Profile
Secondary: editor coverage of stocking, planted-tank scaping, and the long-fin tank-mate caveat.
Try this next
Build the full stocking list with Betta + Rosy Tetra
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: medium. Driven by the lower-confidence profile (Rosy Tetra): Typical care sources — real tanks still vary.