Otocinclus Catfish Overview
Otocinclus is one of the most peaceful freshwater fish for nano, community, and planted aquariums. This small catfish is well known for its strong algae-eating ability and calm temperament. Otocinclus uses its sucker mouth to graze algae from glass, plants, and décor, making it a reliable natural cleanup fish.
Behavior & Compatibility
Otocinclus is highly social and should always be kept in groups of three or more. When kept properly, Otocinclus remains calm and active throughout the tank. It is completely safe with shrimp, snails, live plants, and other peaceful fish. This species thrives in well-oxygenated aquariums with good filtration and gentle to moderate flow.
Appearance & Size
Otocinclus has a slim body covered with armor-like plates.
Natural colors include muted browns, greys, and black patterns.
Adult size: up to 2 inches
Body type: slim, armored
Activity level: active but non-aggressive
Tank Requirements
Otocinclus prefers clean, stable water conditions similar to its native rivers.
Minimum tank size: 10 gallons
Temperature: 74–79°F (23–26°C)
pH range: 6.8–7.5
Water flow: moderate with good aeration
Diet & Feeding
Otocinclus feeds primarily on natural algae found in the aquarium. If algae levels are low, supplement its diet to maintain health.
Natural algae
Algae wafers
Vegetable-based flakes
Feed lightly and consistently to avoid starvation.
Care Level
Otocinclus is easy to care for when kept in groups and provided with stable water quality. Regular maintenance and algae availability are essential for long-term success.
