Can Altum Angelfish live with Koi Angelfish?
Light caution
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
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Design a tank with Altum Angelfish, Koi Angelfish →Everything compatible with Altum Angelfish · …with Koi Angelfish