Can Marbled Crayfish live with Oscar?
Caution — with care
Why
- Marbled Crayfish can grab Oscar while it sleeps — only fast mid/top-water fish are reasonably safe.
Sweet spot: both do well at 74–77°F and pH 6.5–8 — aim there.
Side-by-side
| Marbled Crayfish | Oscar | |
|---|---|---|
| Temperature | 64–77°F | 74–81°F |
| pH | 6.5–8 | 6–8 |
| Hardness (GH) | 5–20 dGH | 5–20 dGH |
| Adult size | 5" | 16" |
| Temperament | Aggressive | Aggressive |
| Min tank | 30 gal | 75 gal |
Together, plan on at least 75 gallons.
How to make it work
- Only combine with fast, mid/top-water fish and give the tankmates plenty of escape routes.
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 Marbled Crayfish, Oscar →Everything compatible with Marbled Crayfish · …with Oscar