Compatibility brief
Can Cockatoo / crested Apistogramma live with Guppy?
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.
100L
Combined minimum footprint reference for these two species: about 100L (larger active fish often want more length).
Cockatoo / crested Apistogramma 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 issueCockatoo / crested Apistogramma is semi-aggressive, while Guppy is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely.
Fin nipping risk
Cockatoo / crested Apistogramma is a known fin nipper and Guppy has long, flowing fins. Cockatoo / crested Apistogramma will likely harass Guppy.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
Narrow pH overlap
These fish can share water but their ideal pH ranges overlap only slightly. Aim to keep pH stable in the shared range.
“Cockatoo / crested Apistogramma 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 Cockatoo / crested Apistogramma with long-finned fish like Guppy.
- Seriously Fish. Apistogramma cacatuoides
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Apistogramma cacatuoides
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Apistogramma cacatuoides
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. 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.
Try this next
Build the full stocking list with Cockatoo / crested Apistogramma + Guppy
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.