Compatibility brief
Can Brown / hockey-stick pencilfish live with Pea Puffer?
Caution. Check the issues below before buying.
Brown / hockey-stick pencilfish + Pea Puffer: Temperament difference. Pea Puffer is semi-aggressive, while Brown / hockey-stick pencilfish 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.
100L
Combined minimum footprint reference for these two species: about 100L (larger active fish often want more length).
Pea Puffer is a fin nipper and Brown / hockey-stick pencilfish is vulnerable to nipping — long fins are a common target even when water parameters match.
Assessment details
Temperament difference
Top issuePea Puffer is semi-aggressive, while Brown / hockey-stick pencilfish is peaceful. This can work with adequate space and hiding spots, but monitor for bullying.
Fin nipping risk
Pea Puffer is a known fin nipper and Brown / hockey-stick pencilfish has long, flowing fins. Pea Puffer will likely harass Brown / hockey-stick pencilfish.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Pea Puffer is semi-aggressive, while Brown / hockey-stick…”
Temperament difference
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so Brown / hockey-stick pencilfish can escape if harassed.
- •Avoid keeping Pea Puffer with long-finned fish like Brown / hockey-stick pencilfish.
- •Brown / hockey-stick pencilfish should be kept in a group of at least 6 for best health and behaviour.
- •Pea Puffer should be kept in a group of at least 6 for best health and behaviour.
Try instead
- →Provide plenty of hiding spots and visual breaks so Brown / hockey-stick pencilfish can escape if harassed.
- →Avoid keeping Pea Puffer with long-finned fish like Brown / hockey-stick pencilfish.
- →Brown / hockey-stick pencilfish should be kept in a group of at least 6 for best health and behaviour.
- →Pea Puffer should be kept in a group of at least 6 for best health and behaviour.
- Seriously Fish. Nannostomus eques
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Nannostomus eques
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Nannostomus eques
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. Carinotetraodon travancoricus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Carinotetraodon travancoricus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Carinotetraodon travancoricus
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 Brown / hockey-stick pencilfish + Pea Puffer
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.