Can Koi Angelfish live with Betta (Siamese Fighting Fish)?
Caution — with care
Why
- Betta (Siamese Fighting Fish) is semi-aggressive and may bully the peaceful Koi Angelfish — give lots of space and cover.
Sweet spot: both do well at 78–82°F and pH 6–7.5 — aim there.
Side-by-side
| Koi Angelfish | Betta (Siamese Fighting Fish) | |
|---|---|---|
| Temperature | 78–84°F | 76–82°F |
| pH | 6–7.5 | 6–7.5 |
| Hardness (GH) | 3–12 dGH | 2–12 dGH |
| Adult size | 6" | 2.5" |
| Temperament | Peaceful | Semi-aggressive |
| Min tank | 30 gal | 5 gal |
Together, plan on at least 30 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.
- Use a larger, well-decorated tank with sightline breaks, keep everyone well-fed, and add the calmer fish first.
Sort it with: GH remineraliser → Aquarium Co-Op
Where to buy
- Koi Angelfish: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Betta (Siamese Fighting Fish): buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
Live-animal shipping: add a heat pack below 50°F, expect weather holds above 90°F, and schedule delivery for a moderate week when someone can receive it promptly.
Build a full tank around this stocking →Everything compatible with Koi Angelfish · …with Betta (Siamese Fighting Fish)