Compatibility Overview
Chili Rasbora 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 | Chili Rasbora | Rainbow Shark | Verdict |
|---|---|---|---|
| Temperature | 68–82°F | 72–79°F | ✅ 72–79°F |
| pH Range | 4.0–7.0 | 6.5–7.5 | ⚠️ 6.5–7.0 (narrow) |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 0.8 in | 6 in | ❌ 8× difference |
| Min. Group | 8+ | 1+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Chili Rasbora — Boraras brigittae
Vivid red nano fish from Borneo blackwater habitats. Extremely small — only safe with fish too small to swallow them.
→ Full Chili Rasbora 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 Chili Rasbora live with Rainbow Shark?
With significant caution and a larger tank. Chili Rasbora 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 Chili Rasbora and Rainbow Shark together?
A minimum of 75 gallons is recommended for keeping Chili Rasbora and Rainbow Shark together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Chili Rasbora and Rainbow Shark?
72–79°F
Is a Chili Rasbora aggressive toward a Rainbow Shark?
Chili Rasbora is peaceful and Rainbow Shark is semi. Limited pH overlap (6.5–7.0) — maintain pH carefully within this narrow window.