Can Koi Angelfish live with Yucatan Molly?
Caution — with care
Why
- Only a narrow pH overlap — keep both around 7.5.
- No overlapping water hardness: Koi Angelfish wants 3–12 dGH but Yucatan Molly wants 15–30 dGH.
Sweet spot: both do well at 78–82°F and pH 7.5–7.5 — aim there.
Side-by-side
| Koi Angelfish | Yucatan Molly | |
|---|---|---|
| Temperature | 78–84°F | 72–82°F |
| pH | 6–7.5 | 7.5–8.5 |
| Hardness (GH) | 3–12 dGH | 15–30 dGH |
| Adult size | 6" | 6" |
| Temperament | Peaceful | Peaceful |
| Min tank | 30 gal | 40 gal |
Together, plan on at least 40 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
- Koi Angelfish: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Yucatan Molly: 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 Yucatan Molly