Can Dwarf Emerald Rasbora (nanus) live with Swordtail?
Caution — with care
Why
- Very different sizes (Swordtail 5.5" vs Dwarf Emerald Rasbora (nanus) 0.7") — these two need different tanks, and the smaller fish will be out-competed at feeding time.
- Only a narrow water hardness overlap — keep both around 12–12 dGH.
- Swordtail is semi-aggressive — give the peaceful Dwarf Emerald Rasbora (nanus) plenty of space, cover and broken sight lines.
Sweet spot: both do well at 72–79°F and pH 7–7.5 — aim there.
Side-by-side
| Dwarf Emerald Rasbora (nanus) | Swordtail | |
|---|---|---|
| Temperature | 72–79°F | 72–82°F |
| pH | 6.5–7.5 | 7–8.4 |
| Hardness (GH) | 5–12 dGH | 12–30 dGH |
| Adult size | 0.7" | 5.5" |
| Temperament | Peaceful | Semi-aggressive |
| Min tank | 10 gal | 29 gal |
Together, plan on at least 29 gallons.
How to make it work
- Target the overlapping water-parameter range and acclimate slowly.
- Use a larger, well-decorated tank with sightline breaks, keep everyone well-fed, and add the calmer fish first.
Sort it with: A larger tank · GH remineraliser
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Design a tank with Dwarf Emerald Rasbora (nanus), Swordtail →Everything compatible with Dwarf Emerald Rasbora (nanus) · …with Swordtail