Can Carnival / Polka Dot Freshwater Crab live with Marbled Crayfish?
Compatible
Why
No conflicts — these two share similar water needs, temperament, and size, and neither is a threat to the other.
Sweet spot: both do well at 75–77°F and pH 7.5–8 — aim there.
Side-by-side
| Carnival / Polka Dot Freshwater Crab | Marbled Crayfish | |
|---|---|---|
| Temperature | 75–82°F | 64–77°F |
| pH | 7.5–8 | 6.5–8 |
| Hardness (GH) | 8–15 dGH | 5–20 dGH |
| Adult size | 1.5" | 5" |
| Temperament | Peaceful | Aggressive |
| Min tank | 10 gal | 30 gal |
Together, plan on at least 30 gallons.
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, Marbled Crayfish →Everything compatible with Carnival / Polka Dot Freshwater Crab · …with Marbled Crayfish
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