Can Betta (Siamese Fighting Fish) live with Oscar?
Not recommended
Why
- Oscar’s mouth is big enough to swallow Betta (Siamese Fighting Fish) (only 2.5" long) — it will be eaten.
- Oscar is aggressive and will fight with Betta (Siamese Fighting Fish) — two scrappy species in one tank means constant territorial conflict.
Side-by-side
| Betta (Siamese Fighting Fish) | Oscar | |
|---|---|---|
| Temperature | 76–82°F | 74–81°F |
| pH | 6–7.5 | 6–8 |
| Hardness (GH) | 2–12 dGH | 5–20 dGH |
| Adult size | 2.5" | 16" |
| Temperament | Semi-aggressive | Aggressive |
| Min tank | 5 gal | 75 gal |
Together, plan on at least 75 gallons.
Compatible alternatives
Instead of Betta (Siamese Fighting Fish) (to keep Oscar):
- Oscar — 16", aggressive
- Kissing Gourami — 12", semi-aggressive
- Giant Gourami — 24", semi-aggressive
Instead of Oscar (to keep Betta (Siamese Fighting Fish)):
- Kissing Gourami — 12", semi-aggressive
- Betta (Siamese Fighting Fish) — 2.5", semi-aggressive
- Siamese Algae Eater — 6", peaceful
Design the whole tank, not just the stocking
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Design a tank with Betta (Siamese Fighting Fish), Oscar →Everything compatible with Betta (Siamese Fighting Fish) · …with Oscar