Can Altum Angelfish live with Koi Angelfish?
Caution — with care
Why
- Only a narrow water hardness overlap — keep both around 3–5 dGH.
Sweet spot: both do well at 82–84°F and pH 6–6.5 — aim there.
Side-by-side
| Altum Angelfish | Koi Angelfish | |
|---|---|---|
| Temperature | 82–88°F | 78–84°F |
| pH | 4.5–6.5 | 6–7.5 |
| Hardness (GH) | 1–5 dGH | 3–12 dGH |
| Adult size | 7" | 6" |
| Temperament | Peaceful | Peaceful |
| Min tank | 75 gal | 30 gal |
Together, plan on at least 75 gallons.
How to make it work
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser → Aquarium Co-Op
Where to buy
- Altum Angelfish: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Koi Angelfish: 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 Altum Angelfish · …with Koi Angelfish