Can Koi Angelfish live with Oscar?
Not recommended
Why
- Oscar’s mouth is big enough to swallow Koi Angelfish (only 6" long) — it will be eaten.
- Oscar is aggressive and will attack the peaceful Koi Angelfish.
Side-by-side
| Koi Angelfish | Oscar | |
|---|---|---|
| Temperature | 78–84°F | 74–81°F |
| pH | 6–7.5 | 6–8 |
| Hardness (GH) | 3–12 dGH | 5–20 dGH |
| Adult size | 6" | 16" |
| Temperament | Peaceful | Aggressive |
| Min tank | 30 gal | 75 gal |
Together, plan on at least 75 gallons.
Compatible alternatives
Instead of Koi Angelfish (to keep Oscar):
- Oscar — 16", aggressive
- Kissing Gourami — 12", semi-aggressive
- Typhoon Pleco — 12", semi-aggressive
Instead of Oscar (to keep Koi Angelfish):
- Kissing Gourami — 12", semi-aggressive
- Giant Gourami — 24", semi-aggressive
- Moonlight Gourami — 6", peaceful
Design the whole tank, not just the stocking
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Design a tank with Koi Angelfish, Oscar →Everything compatible with Koi Angelfish · …with Oscar