Compatibility Overview
Corydoras Catfish 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 | Corydoras Catfish | Rainbow Shark | Verdict |
|---|---|---|---|
| Temperature | 70–79°F | 72–79°F | ✅ 72–79°F |
| pH Range | 6.0–8.0 | 6.5–7.5 | ✅ 6.5–7.5 |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 2.5 in | 6 in | ⚠️ 2.4× difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Corydoras Catfish — Corydoras spp.
Armoured bottom-dwelling catfish that are peaceful with all non-aggressive species. Need fine sand substrate to protect delicate barbels.
→ Full Corydoras Catfish 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 Corydoras Catfish live with Rainbow Shark?
With significant caution and a larger tank. Corydoras Catfish 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 Corydoras Catfish and Rainbow Shark together?
A minimum of 75 gallons is recommended for keeping Corydoras Catfish and Rainbow Shark together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Corydoras Catfish and Rainbow Shark?
72–79°F
Is a Corydoras Catfish aggressive toward a Rainbow Shark?
Corydoras Catfish is peaceful and Rainbow Shark is semi. Minor aggression possible from the semi-aggressive species; provide hiding spots.