Can Harlequin Rasbora live with Sailfin Molly?
Caution — with care
Why
- Sailfin Molly may eat Harlequin Rasbora; add only full-grown adults, because juveniles and fry will be picked off.
- Only a narrow pH overlap — keep both around 7.5.
- Only a narrow water hardness overlap — keep both around 12 dGH.
Sweet spot: both do well at 72–80°F and pH 7.5–7.5 — aim there.
Side-by-side
| Harlequin Rasbora | Sailfin Molly | |
|---|---|---|
| Temperature | 72–80°F | 68–82°F |
| pH | 6–7.5 | 7.5–8.5 |
| Hardness (GH) | 2–12 dGH | 12–30 dGH |
| Adult size | 1.75" | 5" |
| Temperament | Peaceful | Peaceful |
| Min tank | 15 gal | 30 gal |
Together, plan on at least 30 gallons.
How to make it work
- Add only full-grown adults — never juveniles, which will be eaten.
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser → Aquarium Co-Op
Where to buy
- Harlequin Rasbora: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Sailfin Molly: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
Live-animal shipping: add a heat pack below 50°F, expect weather holds above 90°F, and schedule delivery for a moderate week when someone can receive it promptly.
Build a full tank around this stocking →Everything compatible with Harlequin Rasbora · …with Sailfin Molly