Can Black Skirt Tetra live with Boeseman's Rainbowfish?
High risk due to water mismatch, aggression, or predation.
Why Black Skirt Tetra and Boeseman's Rainbowfish Don't Make an Easy Pair
The size gap is 2.0" — Black Skirt Tetra (2.5") and Boeseman's Rainbowfish (4.5"). A fish that fits in another fish's mouth will eventually end up there.
Black Skirt Tetra
Gymnocorymbus ternetzi
| Adult Size: | 2.5" |
| Temperament: | semi-aggressive |
| Min Tank: | 15 gal |
| Temperature: | 68-79°F |
| pH Range: | 6.0-7.5 |
Boeseman's Rainbowfish
Melanotaenia boesemani
| Adult Size: | 4.5" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 75-82°F |
| pH Range: | 7.0-8.0 |
Water Parameter Overlap
| Parameter | Black Skirt Tetra | Boeseman's Rainbowfish | Overlap |
|---|---|---|---|
| Temperature | 68-79°F | 75-82°F | 4°F ✓ |
| pH | 6.0-7.5 | 7.0-8.0 | 0.5 ✓ |
Compatibility Breakdown
Temperament Match: semi-aggressive + peaceful. Semi-aggressive → watch territory and feeding.
⚠️ Size Predation Risk: Black Skirt Tetra (2.5") vs Boeseman's Rainbowfish (4.5"). A 2.0" gap — the larger fish will view the smaller fish as food.
Score: 40.0/100 (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 75°F and 79°F.
- pH: maintain 7.0 – 7.5.
- Hiding spots: essential for Black Skirt Tetra — 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:
High-quality flake food for rainbowfish
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a semi-aggressive individual Black Skirt Tetra 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.