Can Betta (Siamese Fighting Fish) live with Thai Devil Crab?
Caution — with care
Why
- Thai Devil Crab can grab Betta (Siamese Fighting Fish) while it sleeps — only fast mid/top-water fish are reasonably safe.
- Only a narrow pH overlap — keep both around 7.5–7.5.
Sweet spot: both do well at 76–82°F and pH 7.5–7.5 — aim there.
Side-by-side
| Betta (Siamese Fighting Fish) | Thai Devil Crab | |
|---|---|---|
| Temperature | 76–82°F | 75–84°F |
| pH | 6–7.5 | 7.5–8.5 |
| Hardness (GH) | 2–12 dGH | 8–18 dGH |
| Adult size | 2.5" | 2" |
| Temperament | Semi-aggressive | Semi-aggressive |
| Min tank | 5 gal | 20 gal |
Together, plan on at least 20 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.
- Only combine with fast, mid/top-water fish and give the tankmates plenty of escape routes.
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser
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Design a tank with Betta (Siamese Fighting Fish), Thai Devil Crab →Everything compatible with Betta (Siamese Fighting Fish) · …with Thai Devil Crab