Compatibility Overview
Pygmy Corydoras and Rainbow Shark 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 75 gallons), dense planting, and close monitoring are essential.
| Factor | Pygmy Corydoras | Rainbow Shark | Verdict |
|---|---|---|---|
| Temperature | 72–79°F | 72–79°F | ✅ 72–79°F |
| pH Range | 6.0–7.5 | 6.5–7.5 | ✅ 6.5–7.5 |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 1 in | 6 in | ❌ 6× difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Pygmy Corydoras — Corydoras pygmaeus
Tiny armoured catfish that school in open water as well as on the substrate. Peaceful with all non-aggressive species.
→ Full Pygmy Corydoras care guide
Rainbow Shark — Epalzeorhynchos frenatum
Active bottom dweller that becomes territorial at maturity. One per tank; avoid other shark-like or bottom-dwelling species.
Frequently Asked Questions
Can Pygmy Corydoras live with Rainbow Shark?
With significant caution and a larger tank. Pygmy Corydoras and Rainbow Shark 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 75 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Pygmy Corydoras and Rainbow Shark together?
A minimum of 75 gallons is recommended for keeping Pygmy Corydoras and Rainbow Shark together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pygmy Corydoras and Rainbow Shark?
72–79°F
Is a Pygmy Corydoras aggressive toward a Rainbow Shark?
Pygmy Corydoras is peaceful and Rainbow Shark is semi. Minor aggression possible from the semi-aggressive species; provide hiding spots.