Compatibility Overview
Guppy and Otocinclus 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 40-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Guppy | Otocinclus | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 72–82°F | ✅ 72–82°F |
| pH Range | 6.8–8.5 | 6.0–7.5 | ⚠️ 6.8–7.5 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 2.5 in | 1.5 in | ✅ Similar |
| Min. Group | 3+ | 4+ | See below |
| Min. Tank Size | 40 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Guppy — Poecilia reticulata
Hardy and colourful livebearers. Males' long flowing tails make them targets for fin-nipping species. Very prolific breeders.
Otocinclus — Otocinclus spp.
Tiny algae-eating catfish that are peaceful with all species. Need established algae growth and biofilm; sensitive to ammonia.
Frequently Asked Questions
Can Guppy live with Otocinclus?
Yes, in a well-planned setup. Guppy and Otocinclus 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 40-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Guppy and Otocinclus together?
A minimum of 40 gallons is recommended for keeping Guppy and Otocinclus together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Guppy and Otocinclus?
72–82°F
Is a Guppy aggressive toward a Otocinclus?
Guppy is peaceful and Otocinclus is peaceful. Limited pH overlap (6.8–7.5) — maintain pH carefully within this narrow window.