Compatibility brief
Can Brown / hockey-stick pencilfish live with Harlequin Rasbora?
Often a workable match in a suitable, well-run tank. Still verify behaviour in your setup.
In many setups, Brown / hockey-stick pencilfish and Harlequin Rasbora are often kept together in a suitable peaceful community when temperature and pH are matched and the tank is sized for adults. Individual behaviour, filtration, and layout still decide whether it works in your home.
Compatibility score
Profile confidence: high
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).
Assessment details
Compatible temperaments
Both Brown / hockey-stick pencilfish and Harlequin Rasbora share a peaceful temperament.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
Next steps
Concrete changes, not "research more" filler.
- •Brown / hockey-stick pencilfish should be kept in a group of at least 6 for best health and behaviour.
- •Harlequin Rasbora should be kept in a group of at least 6 for best health and behaviour.
Try instead
- →Brown / hockey-stick pencilfish should be kept in a group of at least 6 for best health and behaviour.
- →Harlequin Rasbora 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. Trigonostigma heteromorpha
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Trigonostigma heteromorpha
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Trigonostigma heteromorpha
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 + Harlequin Rasbora
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.