Can Carnival / Polka Dot Freshwater Crab live with Black Sail Cory?
Not recommended
Why
- Carnival / Polka Dot Freshwater Crab hunts along the bottom and will catch the bottom-dwelling Black Sail Cory, especially at night.
- No overlapping pH: Carnival / Polka Dot Freshwater Crab wants 7.5–8 but Black Sail Cory wants 5.5–7.
- Only a narrow water hardness overlap — keep both around 8–10 dGH.
Side-by-side
| Carnival / Polka Dot Freshwater Crab | Black Sail Cory | |
|---|---|---|
| Temperature | 75–82°F | 75–82°F |
| pH | 7.5–8 | 5.5–7 |
| Hardness (GH) | 8–15 dGH | 2–10 dGH |
| Adult size | 1.5" | 2" |
| Temperament | Peaceful | Peaceful |
| Min tank | 10 gal | 20 gal |
Together, plan on at least 20 gallons.
Compatible alternatives
Instead of Carnival / Polka Dot Freshwater Crab (to keep Black Sail Cory):
- Thai Micro Pom Pom Crab — 0.8", peaceful
- Pom Pom Crab — 1", semi-aggressive
- Thai Micro Crab — 0.4", peaceful
Instead of Black Sail Cory (to keep Carnival / Polka Dot Freshwater Crab):
- Cardinal Tetra — 2", peaceful buy at The Shrimp Farm · The Shrimp Farm live-arrival guarantee
- Cherry Barb — 2", peaceful
- False Rummy Nose Tetra — 2", peaceful
Design the whole tank, not just the stocking
Skapelab plans a complete, buildable planted aquarium around your fish — a hand-illustrated layout, the exact plants and hardscape, a placement map, and a full equipment and shopping list. Free.
Design a tank with Carnival / Polka Dot Freshwater Crab, Black Sail Cory →Everything compatible with Carnival / Polka Dot Freshwater Crab · …with Black Sail Cory
Related pairings
Carnival / Polka Dot Freshwater Crab + Neon TetraCarnival / Polka Dot Freshwater Crab + Cherry ShrimpCarnival / Polka Dot Freshwater Crab + AngelfishCarnival / Polka Dot Freshwater Crab + Nerite SnailCarnival / Polka Dot Freshwater Crab + Amano ShrimpCarnival / Polka Dot Freshwater Crab + Harlequin Rasbora