Compatibility Overview
Angelfish 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Angelfish | Otocinclus | Verdict |
|---|---|---|---|
| Temperature | 74–84°F | 72–82°F | ✅ 74–82°F |
| pH Range | 6.0–7.5 | 6.0–7.5 | ✅ 6.0–7.5 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 6 in | 1.5 in | ❌ 4× difference |
| Min. Group | 1+ | 4+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Angelfish — Pterophyllum scalare
Elegant South American cichlids with long flowing fins. Generally peaceful but territorial when breeding and will eat very small fish.
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 Angelfish live with Otocinclus?
Yes, in a well-planned setup. Angelfish 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Angelfish and Otocinclus together?
A minimum of 75 gallons is recommended for keeping Angelfish and Otocinclus together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Angelfish and Otocinclus?
74–82°F
Is a Angelfish aggressive toward a Otocinclus?
Angelfish is semi and Otocinclus is peaceful. Minor aggression possible from the semi-aggressive species; provide hiding spots.