Can Black Molly live with Yucatan Molly?
Compatible
Why
No conflicts — these two share similar water needs, temperament, and size, and neither is a threat to the other.
Sweet spot: both do well at 72–82°F and pH 7.5–8.5 — aim there.
Side-by-side
| Black Molly | Yucatan Molly | |
|---|---|---|
| Temperature | 72–82°F | 72–82°F |
| pH | 7–8.5 | 7.5–8.5 |
| Hardness (GH) | 12–30 dGH | 15–30 dGH |
| Adult size | 4" | 6" |
| Temperament | Peaceful | Peaceful |
| Min tank | 30 gal | 40 gal |
Together, plan on at least 40 gallons.
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Design a tank with Black Molly, Yucatan Molly →Everything compatible with Black Molly · …with Yucatan Molly