Can Carnival / Polka Dot Freshwater Crab live with Pygmy Rasbora?
Caution — with care
Why
- Carnival / Polka Dot Freshwater Crab can grab Pygmy Rasbora while it sleeps — only fast mid/top-water fish are reasonably safe.
- No overlapping pH: Carnival / Polka Dot Freshwater Crab wants 7.5–8 but Pygmy Rasbora wants 5–7.
- Only a narrow water hardness overlap — keep both around 8–8 dGH.
Side-by-side
| Carnival / Polka Dot Freshwater Crab | Pygmy Rasbora | |
|---|---|---|
| Temperature | 75–82°F | 75–82°F |
| pH | 7.5–8 | 5–7 |
| Hardness (GH) | 8–15 dGH | 1–8 dGH |
| Adult size | 1.5" | 0.8" |
| Temperament | Peaceful | Peaceful |
| Min tank | 10 gal | 5 gal |
Together, plan on at least 10 gallons.
How to make it work
- Only combine with fast, mid/top-water fish and give the tankmates plenty of escape routes.
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser
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