Compatibility brief
Can German Blue Ram live with Rainbow / red-tailed black shark?
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.
200L
Combined minimum footprint reference for these two species: about 200L (larger active fish often want more length).
Temperament gap (peaceful vs semi-aggressive) — needs space, structure, and careful observation, not a “drop and forget” mix.
Assessment details
Temperament difference
Top issueRainbow / red-tailed black shark is semi-aggressive, while German Blue Ram is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely.
Narrow temperature overlap
German Blue Ram and Rainbow / red-tailed black shark have only a narrow shared temperature range. Maintaining stable water temperature will be important.
“Rainbow / red-tailed black shark is semi-aggressive, while…”
Temperament difference
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so German Blue Ram can escape if harassed.
- 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.
- Seriously Fish. Epalzeorhynchos frenatum
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Epalzeorhynchos frenatum
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Epalzeorhynchos frenatum
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 German Blue Ram + Rainbow / red-tailed black shark
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.