Otocinclus Catfish – Otocinclus sp. (Oto Catfish)
The Otocinclus Catfish, often called “Otos”, is a small, peaceful algae-eater that makes an excellent addition to freshwater community tanks. Known for their gentle nature and tireless grazing, Otos are especially popular in planted aquariums where they help control algae without harming plants.
These tiny catfish thrive best in groups of 4 or more and spend their time cleaning leaves, glass, and décor, making them both functional and fun to watch.
Key Details:
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Scientific Name: Otocinclus sp.
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Common Name: Oto Catfish, Dwarf Sucker
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Origin: South America (Tank-Raised when available)
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Size Purchased: 0.75" – 1.25"
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Adult Size: ~1.5" – 2"
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Type: Freshwater Catfish
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Temperament: Peaceful, schooling
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Tank Size: 10+ gallons (best in groups)
Water Parameters:
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Temperature: 72–79°F
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pH: 6.5–7.5
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Hardness: Soft to Moderate
Diet:
Primarily herbivorous. Otos feed on soft green algae, biofilm, and blanched vegetables (zucchini, cucumber, spinach). Supplement their diet with algae wafers to ensure proper nutrition.
Care Notes:
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Keep in groups for security and natural behavior.
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Provide a well-established tank with plenty of algae and smooth surfaces to graze.
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Extremely peaceful and safe with shrimp, snails, and small community fish.
Why Choose the Oto Catfish?
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Compact size makes them perfect for nano and planted tanks.
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Excellent natural algae control.
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Hardy, peaceful, and full of personality when kept in groups.