Can Molly live with Pygmy Rasbora?
Caution — with care
Why
- No overlapping water hardness: Molly wants 12–30 dGH but Pygmy Rasbora wants 1–8 dGH.
- Very different sizes (Molly 4" vs Pygmy Rasbora 0.8") — these two need different tanks, and the smaller fish will be out-competed at feeding time.
- Only a narrow pH overlap — keep both around 7–7.
Sweet spot: both do well at 75–82°F and pH 7–7 — aim there.
Side-by-side
| Molly | Pygmy 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 | 5 gal |
Together, plan on at least 30 gallons.
How to make it work
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser · A larger tank
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Design a tank with Molly, Pygmy Rasbora →Everything compatible with Molly · …with Pygmy Rasbora