Compatibility brief
Can Golden / Beckford's pencilfish live with Green Terror?
Risky. This mix is commonly discouraged for typical setups.
Compatibility score
Profile confidence: medium
How we decideFishori checks adult size and predation risk, behaviour, water requirements and tank needs before giving a verdict.
300L
Combined minimum footprint reference for these two species: about 300L (larger active fish often want more length).
Green Terror (about 30cm as an adult) can realistically eat Golden / Beckford's pencilfish (about 4.5cm) once grown. Plan around adult sizes, not shop sizes.
Golden / Beckford's pencilfish (peaceful) and Green Terror (aggressive) are far apart on aggression — bullying or injury is a common outcome in average community layouts.
Assessment details
Aggression mismatch
Top issueGreen Terror is aggressive, while Golden / Beckford's pencilfish is peaceful. The aggressive fish will likely bully or harm the peaceful one.
Green Terror may eat Golden / Beckford's pencilfish
Green Terror (30cm) is predatory and Golden / Beckford's pencilfish (4.5cm) is small enough to be eaten. This pairing is unsafe.
Narrow temperature overlap
Golden / Beckford's pencilfish and Green Terror have only a narrow shared temperature range. Maintaining stable water temperature will be important.
“Green Terror is aggressive, while Golden / Beckford's…”
Aggression mismatch
Next steps
Concrete changes, not "research more" filler.
- •Golden / Beckford's pencilfish should be kept in a group of at least 6 for best health and behaviour.
- •Green Terror reaches ~30cm: tank length and turning room matter more than the litre number. A tall, short tank of the same volume is not equivalent.
Try instead
- →Build a species-only tank for the larger fish, or restock with fish too large to be eaten at adult sizes.
- Seriously Fish. Nannostomus beckfordi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Nannostomus beckfordi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Nannostomus beckfordi
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. Andinoacara rivulatus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Andinoacara rivulatus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Andinoacara rivulatus
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 Golden / Beckford's pencilfish + Green Terror
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.