Compatibility Overview
Chili Rasbora and Molly 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 | Molly | Verdict |
|---|---|---|---|
| Temperature | 68–82°F | 72–82°F | ✅ 72–82°F |
| pH Range | 4.0–7.0 | 7.5–8.5 | ❌ No overlap |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 0.8 in | 4 in | ❌ 5× difference |
| Min. Group | 8+ | 3+ | 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
Molly — Poecilia sphenops
Hardy livebearers that prefer alkaline, hard water — sometimes slightly brackish. Prolific breeders; peaceful community fish.
Frequently Asked Questions
Can Chili Rasbora live with Molly?
With significant caution and a larger tank. Chili Rasbora and Molly 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 Molly together?
A minimum of 75 gallons is recommended for keeping Chili Rasbora and Molly together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Chili Rasbora and Molly?
72–82°F
Is a Chili Rasbora aggressive toward a Molly?
Chili Rasbora is peaceful and Molly is peaceful. pH ranges barely or do not overlap: Chili Rasbora prefers 4.0–7.0; Molly prefers 7.5–8.5.