Can Carnival / Polka Dot Freshwater Crab live with Cardinal Shrimp?
Caution — with care
Why
- Carnival / Polka Dot Freshwater Crab is not on the verified shrimp-safe list, so we will not recommend it over a breeding Cardinal Shrimp colony. It may well be fine — it simply has not been confirmed by a source, and an unverified guess is not worth the colony.
- Carnival / Polka Dot Freshwater Crab hunts shrimp. Cardinal Shrimp is large enough to be awkward prey, but not safe.
- Carnival / Polka Dot Freshwater Crab will eat Cardinal Shrimp shrimplets. The colony still grows if there is moss or another dense hiding place for the babies.
Sweet spot: both do well at 79–82°F and pH 7.5–8 — aim there.
Side-by-side
| Carnival / Polka Dot Freshwater Crab | Cardinal Shrimp | |
|---|---|---|
| Temperature | 75–82°F | 79–84°F |
| pH | 7.5–8 | 7.5–8.5 |
| Hardness (GH) | 8–15 dGH | 8–18 dGH |
| Adult size | 1.5" | 0.8" |
| Temperament | Peaceful | Peaceful |
| Min tank | 10 gal | 15 gal |
Together, plan on at least 15 gallons.
How to make it work
- Keep a large, established shrimp colony in a heavily planted tank with moss and cover so enough survive to breed.
Sort it with: GH remineraliser
Design the whole tank, not just the stocking
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Design a tank with Carnival / Polka Dot Freshwater Crab, Cardinal Shrimp →Everything compatible with Carnival / Polka Dot Freshwater Crab · …with Cardinal Shrimp
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