Compatibility Overview
Discus and Pea Puffer are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Discus | Pea Puffer | Verdict |
|---|---|---|---|
| Temperature | 82–88°F | 74–82°F | ⚠️ 82–82°F (narrow) |
| pH Range | 5.0–7.0 | 7.0–8.0 | ⚠️ 7.0–7.0 (narrow) |
| Temperament | semi | semi | ⚠️ Monitor |
| Adult Size | 8 in | 1 in | ❌ 8× difference |
| Min. Group | 5+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Discus — Symphysodon spp.
The 'king of the aquarium' — beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
Pea Puffer — Carinotetraodon travancoricus
World's smallest pufferfish — intensely territorial and nippy despite tiny size. Will attack fins and eat shrimp and snails.
Frequently Asked Questions
Can Discus live with Pea Puffer?
Generally not recommended. Discus and Pea Puffer are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Discus and Pea Puffer together?
A minimum of 100 gallons is recommended for keeping Discus and Pea Puffer together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Pea Puffer?
82–82°F (narrow)
Is a Discus aggressive toward a Pea Puffer?
Discus is semi and Pea Puffer is semi. Minimal temperature overlap (82–82°F) — difficult to satisfy both species simultaneously.