Can Black Skirt Tetra live with Siamese Algae Eater?
Case-by-case. Watch group sizes, tank size, and feeding zones.
Why Black Skirt Tetra and Siamese Algae Eater Don't Make an Easy Pair
They can coexist, but you need to manage the setup carefully. The temperament combination (semi-aggressive+peaceful) can work, but you will need to watch them at feeding time for the first week.
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 |
Siamese Algae Eater
Crossocheilus oblongus
| Adult Size: | 6.0" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
Water Parameter Overlap
| Parameter | Black Skirt Tetra | Siamese Algae Eater | Overlap |
|---|---|---|---|
| Temperature | 68-79°F | 75-82°F | 4°F ✓ |
| pH | 6.0-7.5 | 6.5-7.5 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: semi-aggressive + peaceful. Semi-aggressive → watch territory and feeding.
⚠️ Size Predation Risk: Black Skirt Tetra (2.5") vs Siamese Algae Eater (6.0"). A 3.5" gap — the larger fish will view the smaller fish as food.
Score: 50.0/100 (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 6.5 – 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:
Herbivore sinking rounds for algae eaters
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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.