Compatibility Overview
Betta Fish and Pygmy Corydoras can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
| Factor | Betta Fish | Pygmy Corydoras | Verdict |
|---|---|---|---|
| Temperature | 76–82°F | 72–79°F | ⚠️ 76–79°F (narrow) |
| pH Range | 6.5–7.5 | 6.0–7.5 | ✅ 6.5–7.5 |
| Temperament | aggressive | peaceful | ❌ Risk |
| Adult Size | 3 in | 1 in | ⚠️ 3.0× difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Betta Fish — Betta splendens
Vibrant labyrinth fish from Southeast Asia. Males are highly territorial toward other bettas and fin-nippers; compatible with many peaceful species in large, planted tanks.
Pygmy Corydoras — Corydoras pygmaeus
Tiny armoured catfish that school in open water as well as on the substrate. Peaceful with all non-aggressive species.
Frequently Asked Questions
Can Betta Fish live with Pygmy Corydoras?
With significant caution and a larger tank. Betta Fish and Pygmy Corydoras can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 55 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Betta Fish and Pygmy Corydoras together?
A minimum of 55 gallons is recommended for keeping Betta Fish and Pygmy Corydoras together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Betta Fish and Pygmy Corydoras?
76–79°F (narrow)
Is a Betta Fish aggressive toward a Pygmy Corydoras?
Betta Fish is aggressive and Pygmy Corydoras is peaceful. Narrow temperature overlap (76–79°F) — keeping the tank at exactly 77–78°F is needed for both species.