Compatibility brief
Can Cardinal Tetra live with German Blue Ram?
Caution. Check the issues below before buying.
Cardinal Tetra + German Blue Ram: Narrow temperature overlap. Cardinal Tetra and German Blue Ram have only a narrow shared temperature range. Maintaining stable water temperature will be important. Outcomes still depend on your tank shape, maintenance routine, and individual fish.
Compatibility score
Profile confidence: medium
Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.
80L
Combined minimum footprint reference for these two species: about 80L (larger active fish often want more length).
Assessment details
Compatible temperaments
Both Cardinal Tetra and German Blue Ram share a peaceful temperament.
Narrow temperature overlap
Top issueCardinal Tetra and German Blue Ram have only a narrow shared temperature range. Maintaining stable water temperature will be important.
“Cardinal Tetra and German Blue Ram have only a narrow shared…”
Narrow temperature overlap
Next steps
Concrete changes, not "research more" filler.
- •Cardinal Tetra should be kept in a group of at least 6 for best health and behaviour.
Try instead
- →Cardinal Tetra should be kept in a group of at least 6 for best health and behaviour.
- Seriously Fish. Paracheirodon axelrodi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Paracheirodon axelrodi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Paracheirodon axelrodi
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Paracheirodon axelrodi (cardinal tetra)
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
- Seriously Fish. Mikrogeophagus ramirezi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Mikrogeophagus ramirezi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Mikrogeophagus ramirezi
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 Cardinal Tetra + German Blue Ram
Plan further
Try both species in the full-stock tank check, or open either fish profile for mates lists. 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. Based on multiple reputable aquarium care sources with strong agreement.