Fish care
Otocinclus: Complete Care Guide
Last updated: May 2026
Summary
Structured care sheet for Otocinclus (Otocinclus affinis). Validate every purchase with the free aquarium stocking calculator, parameter testing habits, and the species database table.
- Cross-check length and temperature against the species explorer.
- Track nitrate drift weekly once the tank has cycled.
- Refer to the species hub for long-form tank mate essays.
Max size4 cm / 1.6in
Temperature20-27°C / 68–81°F
pH range6–7.5
Min tank size60 L / 16 US gal
Care levelIntermediate
TemperamentPeaceful shoaling grazers
DietHerbivore
Swim zoneVaries
Mature tank rule
Otocinclus starve in freshly booted tanks lacking Aufwuchs. Establish algae and biofilm first, then add six-plus individuals so confidence schooling returns.
Transport sensitivity
Starved chain-store ottos often die in weeks; look for rounded bellies and active rasping before purchase - then supplement blanched veg weekly.
See tank mate combinations tuned to temperament overlap.
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