Harlequin Rasbora Care & Compatibility
Trigonostigma heteromorpha
A peaceful, hardy schooler with a bold black triangle — a community staple.
Min 10 gal 1.8" adult Peaceful Easy care 73-82°F
Care requirements
| Scientific name | Trigonostigma heteromorpha |
|---|---|
| Group | Rasbora |
| Adult size | 1.8 in (4.6 cm) |
| Minimum tank | 10 gallons |
| Temperature | 73-82°F |
| pH | 6-7.5 |
| Hardness | 2-15 dGH |
| Temperament | Peaceful |
| Social | Schooling (keep 6+) |
| Diet | Omnivore |
| Swim level | Mid |
| Care level | Easy |
| Lifespan | ~5 years |
Best tankmates for Harlequin Rasbora
Neon Tetra
Ok · 10 gal+
Cardinal Tetra
Ok · 20 gal+
Guppy
Ok · 10 gal+
Endler's Livebearer
Ok · 10 gal+
Platy
Ok · 10 gal+
Molly
Ok · 20 gal+
Swordtail
Ok · 20 gal+
Dwarf Gourami
Ok · 10 gal+
Pearl Gourami
Ok · 30 gal+
Honey Gourami
Ok · 10 gal+
Avoid keeping with
Angelfish
Not recommended
Discus
Not recommended
Kribensis
Not recommended
White Cloud Mountain Minnow
Not recommended
Frequently asked questions
What size tank does a Harlequin Rasbora need?
A Harlequin Rasbora needs a minimum of 10 gallons. Because it is a schooling fish, keep a group of at least 6, which may require more space.
Is the Harlequin Rasbora good for beginners?
The Harlequin Rasbora is rated easy to care for. It is a great choice for beginners.
What water parameters does a Harlequin Rasbora need?
Keep Harlequin Rasbora at 73-82°F, pH 6-7.5, and hardness 2-15 dGH.
How many Harlequin Rasbora should I keep together?
Keep at least 6 together — they are happier and less stressed in a group.