Compatibility Overview
Pea Puffer and Swordtail 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 | Pea Puffer | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 74–82°F | 65–80°F | ✅ 74–80°F |
| pH Range | 7.0–8.0 | 7.0–8.3 | ✅ 7.0–8.0 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 1 in | 5 in | ❌ 5× difference |
| Min. Group | 1+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Pea Puffer — Carinotetraodon travancoricus
World's smallest pufferfish — intensely territorial and nippy despite tiny size. Will attack fins and eat shrimp and snails.
Swordtail — Xiphophorus hellerii
Hardy livebearer with a distinctive elongated lower tail fin in males. Peaceful community fish that tolerate a wide temperature range.
Frequently Asked Questions
Can Pea Puffer live with Swordtail?
With significant caution and a larger tank. Pea Puffer and Swordtail 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 Pea Puffer and Swordtail together?
A minimum of 55 gallons is recommended for keeping Pea Puffer and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Pea Puffer and Swordtail?
74–80°F
Is a Pea Puffer aggressive toward a Swordtail?
Pea Puffer is semi and Swordtail is peaceful. Minor aggression possible from the semi-aggressive species; provide hiding spots.