Can Black Molly live with Discus?
Caution — with care
Why
- Only a narrow temperature overlap — keep both around 82°F.
- Only a narrow pH overlap — keep both around 7.
- No overlapping water hardness: Black Molly wants 12–30 dGH but Discus wants 1–8 dGH.
Sweet spot: both do well at 82–82°F and pH 7–7 — aim there.
Side-by-side
| Black Molly | Discus | |
|---|---|---|
| Temperature | 72–82°F | 82–88°F |
| pH | 7–8.5 | 5.5–7 |
| Hardness (GH) | 12–30 dGH | 1–8 dGH |
| Adult size | 4" | 8" |
| Temperament | Peaceful | Peaceful |
| Min tank | 30 gal | 55 gal |
Together, plan on at least 55 gallons.
How to make it work
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: An adjustable heater → Chewy GH remineraliser → Aquarium Co-Op
Where to buy
- Black Molly: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Discus: 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 Black Molly · …with Discus