Can Angelfish live with Siamese Algae Eater?
These two species are usually compatible in community tanks.
Why Angelfish and Siamese Algae Eater Work
These two species overlap in both temperature (75–82°F overlap) and pH (6.5-7.5 overlap range). Their temperature tolerances are close enough, and neither fish pushes the pH so far outside the other's comfort zone that it creates chronic stress. The temperament match (semi-aggressive + peaceful) is low-conflict. In a 40+ gallon tank with adequate hiding spots, these two can coexist with minimal problems.
Angelfish
Pterophyllum scalare
| Adult Size: | 5.9" |
| Temperament: | semi-aggressive |
| Min Tank: | 40 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
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 | Angelfish | Siamese Algae Eater | Overlap |
|---|---|---|---|
| Temperature | 75-82°F | 75-82°F | 7°F ✓ |
| pH | 6.5-7.5 | 6.5-7.5 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: semi-aggressive + peaceful. Semi-aggressive → watch territory and feeding.
Score: 110.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 40 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 75°F and 82°F.
- pH: maintain 6.5 – 7.5.
- Hiding spots: essential for Angelfish — 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 40+ gallons:
57-gallon kit suitable for angelfish
Explore Related Checks
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a semi-aggressive individual Angelfish 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.