Can Carnival / Polka Dot Freshwater Crab live with Hengel's Rasbora?
Caution — with care
Why
- Carnival / Polka Dot Freshwater Crab can grab Hengel's Rasbora while it sleeps — only fast mid/top-water fish are reasonably safe.
- Only a narrow pH overlap — keep both around 7.5–7.5.
- Only a narrow water hardness overlap — keep both around 8–10 dGH.
Sweet spot: both do well at 75–82°F and pH 7.5–7.5 — aim there.
Side-by-side
| Carnival / Polka Dot Freshwater Crab | Hengel's Rasbora | |
|---|---|---|
| Temperature | 75–82°F | 73–82°F |
| pH | 7.5–8 | 5.5–7.5 |
| Hardness (GH) | 8–15 dGH | 6–10 dGH |
| Adult size | 1.5" | 1.2" |
| Temperament | Peaceful | Peaceful |
| Min tank | 10 gal | 15 gal |
Together, plan on at least 15 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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