Can Upside-Down Catfish live with White Cloud Minnow?
Case-by-case. Watch group sizes, tank size, and feeding zones.
Why Upside-Down Catfish and White Cloud Minnow Don't Make an Easy Pair
They can coexist, but you need to manage the setup carefully. The temperature margin is tight — only 3°F of safe overlap, which leaves little room for thermostat drift.
Upside-Down Catfish
Synodontis nigriventris
| Adult Size: | 3.5" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 72-82°F |
| pH Range: | 6.0-7.5 |
White Cloud Minnow
Tanichthys albonubes
| Adult Size: | 1.5" |
| Temperament: | peaceful |
| Min Tank: | 10 gal |
| Temperature: | 60-75°F |
| pH Range: | 6.0-8.0 |
Water Parameter Overlap
| Parameter | Upside-Down Catfish | White Cloud Minnow | Overlap |
|---|---|---|---|
| Temperature | 72-82°F | 60-75°F | 3°F ✓ |
| pH | 6.0-7.5 | 6.0-8.0 | 1.5 ✓ |
Compatibility Breakdown
Temperament Match: peaceful + peaceful. Both peaceful → minimal conflict.
⚠️ Size Predation Risk: Upside-Down Catfish (3.5") vs White Cloud Minnow (1.5"). A 2.0" gap — the larger fish will view the smaller fish as food.
Score: 60.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 30 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 72°F and 75°F.
- pH: maintain 6.0 – 7.5.
- Hiding spots: essential for Upside-Down Catfish — 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 30+ gallons:
Sinking wafers for nocturnal catfish
Explore Related Checks
See what else works with these fish:
⚠️ Common Reasons This Pairing Fails in Practice
- Narrow temperature margin: Only 3°F of overlap means a stuck heater or seasonal temperature swing can push one species out of its comfort zone.
- Size-based predation: The 2.0" size gap means the larger fish may eat the smaller one once it grows to full size. This is not fixable with more hiding spots.
- Overcrowding: Even compatible species fail in tanks that are too small. Double the species means double the bioload — 25% weekly water changes are the minimum.
- Inadequate acclimation: Adding both species on the same day without quarantine is a common mistake. Always drip-acclimate new arrivals and quarantine for 2–4 weeks.
Tools & Resources
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a peaceful individual Upside-Down Catfish 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.