Compatibility brief
Can Guppy live with Rainbow / red-tailed black shark?
Caution. Check the issues below before buying.
Guppy + Rainbow / red-tailed black shark: Temperament difference. Rainbow / red-tailed black shark is semi-aggressive, while Guppy is peaceful. This can work with adequate space and hiding spots, but monitor for bullying. 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.
200L
Combined minimum footprint reference for these two species: about 200L (larger active fish often want more length).
Rainbow / red-tailed black shark is a fin nipper and Guppy is vulnerable to nipping — long fins are a common target even when water parameters match.
Assessment details
Temperament difference
Top issueRainbow / red-tailed black shark is semi-aggressive, while Guppy is peaceful. This can work with adequate space and hiding spots, but monitor for bullying.
Fin nipping risk
Rainbow / red-tailed black shark is a known fin nipper and Guppy has long, flowing fins. Rainbow / red-tailed black shark will likely harass Guppy.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“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 Guppy can escape if harassed.
- •Avoid keeping Rainbow / red-tailed black shark with long-finned fish like Guppy.
Try instead
- →Provide plenty of hiding spots and visual breaks so Guppy can escape if harassed.
- →Avoid keeping Rainbow / red-tailed black shark with long-finned fish like Guppy.
- Seriously Fish. Poecilia reticulata
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Poecilia reticulata
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Poecilia reticulata
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Guppy
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
- 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 Guppy + Rainbow / red-tailed black shark
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.