A beginner-friendly fish guide

Harlequin Rasbora

Harlequin Rasbora

Trigonostigma heteromorpha

Gentle temperament; shoaling fish. Check the planner before choosing tank mates.

Beginner level 5/5

A good environment

Recommended temperature
23 ~ 27°C
Recommended pH
5.8 ~ 7.3
Preferred water hardness
Medium hardness
Minimum aquarium
54L or more

Reference sources list a wider range of 21~28°C and pH 5.0~7.5. The planner uses the narrower range above as a safer starting point for beginners.

At a glance

Group
Rasboras
Average adult size
about 4.5 cm (small)
Minimum tank length
about 60 cm
Activity level
Moderate
Waste level
Low
Lid recommended
Not required
Mature tank preferred
Not required

Temperament & group size

Gentle temperament; Shoaling fish.

For a comfortable group, keep at least 6.

Usually swims in the upper & middle.

Tank-mate notes

Adult shrimp may do well with hiding places, though individual fish vary.

Baby shrimp may be eaten. A separate breeding tank is safer.

Check each combination carefully, especially when size or temperament differs.

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Frequently asked questions

How big does Harlequin Rasbora get, and what tank size does it need?

Adults average about 4.5 cm, a small species. The planner recommends an aquarium of at least 54 L and about 60 cm long.

What water temperature and pH does Harlequin Rasbora need?

The planner range is 23~27°C and pH 5.8~7.3, with medium hardness. Reference sources list a wider range of 21~28°C and pH 5.0~7.5. The planner uses the narrower range above as a safer starting point for beginners.

How many Harlequin Rasbora should be kept together?

Shoaling fish: keep at least 6. Temperament is gentle.

Can Harlequin Rasbora live with shrimp?

Adult shrimp: usually fine. Baby shrimp: not recommended.

Is Harlequin Rasbora a good fish for beginners?

Beginner level 5/5. Activity: moderate; waste: low.