Can Celestial Pearl Danio live with Discus?
High risk due to water mismatch, aggression, or predation.
Why Celestial Pearl Danio and Discus Don't Make an Easy Pair
There is no temperature overlap — Celestial Pearl Danio needs 73-79°F while Discus needs 82-86°F. One of them will be outside its safe range constantly, which leads to chronic stress and disease. The size gap is 7.0" — Celestial Pearl Danio (1.0") and Discus (8.0"). A fish that fits in another fish's mouth will eventually end up there.
Celestial Pearl Danio
Danio margaritatus
| Adult Size: | 1.0" |
| Temperament: | peaceful |
| Min Tank: | 10 gal |
| Temperature: | 73-79°F |
| pH Range: | 6.5-7.5 |
Discus
Symphysodon aequifasciatus
| Adult Size: | 8.0" |
| Temperament: | peaceful |
| Min Tank: | 55 gal |
| Temperature: | 82-86°F |
| pH Range: | 6.0-7.0 |
Water Parameter Overlap
| Parameter | Celestial Pearl Danio | Discus | Overlap |
|---|---|---|---|
| Temperature | 73-79°F | 82-86°F | No overlap ✗ |
| pH | 6.5-7.5 | 6.0-7.0 | 0.5 ✓ |
Compatibility Breakdown
Temperament Match: peaceful + peaceful. Both peaceful → minimal conflict.
⚠️ Size Predation Risk: Celestial Pearl Danio (1.0") vs Discus (8.0"). A 7.0" gap — the larger fish will view the smaller fish as food.
⚠️ Diet Conflict: A carnivore sharing water with a fish small enough to fit in its mouth is a waiting game. Feed generously, but the risk is structural — not something you can manage meal by meal.
Score: 10.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 55 gallons — sized for the larger fish in the pair.
- Temperature: no safe overlap range exists. A heater is not enough to fix this pairing.
- pH: maintain 6.5 – 7.0.
- Hiding spots: essential for Celestial Pearl Danio — caves, plants, or driftwood to retreat when feeling stressed.
- Water changes: 25% weekly minimum. Two species mean double the bioload.
🔧 Tank Stocking Calculator
Enter tank size to calculate safe stocking levels:
Recommended Equipment
Based on tank size 55+ gallons:
Premium canister filter for discus tanks
Explore Related Checks
See what else works with these fish:
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a peaceful individual Celestial Pearl Danio may act differently from its species average. Always observe, quarantine new arrivals for 2-4 weeks, and avoid overcrowding. If a pairing says CAUTION, start with a smaller group and a lid.