Can Black Molly live with Least Rasbora?
Not recommended
Why
- Black Molly’s mouth is big enough to swallow Least Rasbora (only 0.8" long) — it will be eaten.
- Only a narrow pH overlap — keep both around 7.
- No overlapping water hardness: Black Molly wants 12–30 dGH but Least Rasbora wants 1–8 dGH.
Side-by-side
| Black Molly | Least Rasbora | |
|---|---|---|
| Temperature | 72–82°F | 75–82°F |
| pH | 7–8.5 | 5–7 |
| Hardness (GH) | 12–30 dGH | 1–8 dGH |
| Adult size | 4" | 0.8" |
| Temperament | Peaceful | Peaceful |
| Min tank | 30 gal | 10 gal |
Together, plan on at least 30 gallons.
Compatible alternatives
Instead of Black Molly (to keep Least Rasbora):
- Thick-lipped Gourami — 3.5", peaceful buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Noble Gourami — 3", peaceful buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Betta (Siamese Fighting Fish) — 2.5", semi-aggressive buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
Instead of Least Rasbora (to keep Black Molly):
- Lambchop Rasbora — 1.25", peaceful buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Croaking Gourami — 3", peaceful buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Cherry Barb — 2", peaceful buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
Where to buy
- Black Molly: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Least Rasbora: 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 Black Molly · …with Least Rasbora