Can Discus live with Swordtail?
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: Discus wants 1–8 dGH but Swordtail wants 12–30 dGH.
Sweet spot: both do well at 82–82°F and pH 7–7 — aim there.
Side-by-side
| Discus | Swordtail | |
|---|---|---|
| Temperature | 82–88°F | 72–82°F |
| pH | 5.5–7 | 7–8.4 |
| Hardness (GH) | 1–8 dGH | 12–30 dGH |
| Adult size | 8" | 5.5" |
| Temperament | Peaceful | Peaceful |
| Min tank | 55 gal | 29 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
- Discus: buy at Flip Aquatics · Flip Aquatics live-arrival guarantee
- Swordtail: 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 Discus · …with Swordtail