Compatibility Overview
Dwarf Gourami and Harlequin Rasbora can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Dwarf Gourami | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 72–81°F | ✅ 72–81°F |
| pH Range | 6.0–7.5 | 5.5–7.5 | ✅ 6.0–7.5 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 3.5 in | 1.75 in | ⚠️ 2.0× difference |
| Min. Group | 1+ | 8+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Dwarf Gourami — Trichogaster lalius
Colourful labyrinth fish that is generally peaceful but can be territorial toward similar species. Susceptible to Dwarf Gourami Iridovirus.
→ Full Dwarf Gourami care guide
Harlequin Rasbora — Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Dwarf Gourami live with Harlequin Rasbora?
Yes, in a well-planned setup. Dwarf Gourami and Harlequin Rasbora can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Dwarf Gourami and Harlequin Rasbora together?
A minimum of 55 gallons is recommended for keeping Dwarf Gourami and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Dwarf Gourami and Harlequin Rasbora?
72–81°F
Is a Dwarf Gourami aggressive toward a Harlequin Rasbora?
Dwarf Gourami is semi and Harlequin Rasbora is peaceful. Minor aggression possible from the semi-aggressive species; provide hiding spots.