Compatibility Overview
Otocinclus and Pea Puffer can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Otocinclus | Pea Puffer | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 74–82°F | ✅ 74–82°F |
| pH Range | 6.0–7.5 | 7.0–8.0 | ⚠️ 7.0–7.5 (narrow) |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 1.5 in | 1 in | ✅ Similar |
| Min. Group | 4+ | 1+ | See below |
| Min. Tank Size | 29 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Otocinclus — Otocinclus spp.
Tiny algae-eating catfish that are peaceful with all species. Need established algae growth and biofilm; sensitive to ammonia.
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 Otocinclus live with Pea Puffer?
Yes, in a well-planned setup. Otocinclus and Pea Puffer can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Otocinclus and Pea Puffer together?
A minimum of 29 gallons is recommended for keeping Otocinclus and Pea Puffer together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Otocinclus and Pea Puffer?
74–82°F
Is a Otocinclus aggressive toward a Pea Puffer?
Otocinclus is peaceful and Pea Puffer is semi. Limited pH overlap (7.0–7.5) — maintain pH carefully within this narrow window.