Can Marbled Crayfish live with Swordtail?
Caution — with care
Why
- Marbled Crayfish can grab Swordtail while it sleeps — only fast mid/top-water fish are reasonably safe.
Sweet spot: both do well at 72–77°F and pH 7–8 — aim there.
Side-by-side
| Marbled Crayfish | Swordtail | |
|---|---|---|
| Temperature | 64–77°F | 72–82°F |
| pH | 6.5–8 | 7–8.4 |
| Hardness (GH) | 5–20 dGH | 12–30 dGH |
| Adult size | 5" | 5.5" |
| Temperament | Aggressive | Semi-aggressive |
| Min tank | 30 gal | 29 gal |
Together, plan on at least 30 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
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Design a tank with Marbled Crayfish, Swordtail →Everything compatible with Marbled Crayfish · …with Swordtail