Otocinclus Catfish, commonly known as “Otos” or dwarf suckermouth catfish, are small, peaceful freshwater fish prized for their algae-eating abilities and gentle nature. Native to rivers and streams in South America, these tiny catfish are ideal for planted aquariums and community tanks due to their small size, usually growing between 1–2 inches in length, and their non-aggressive temperament.

Otocinclus Catfish are social fish that thrive in groups of at least 4–6 individuals. Schooling provides them with a sense of security and encourages natural behavior, making them more active and visible in the aquarium. They prefer tanks with plenty of plants, driftwood, and smooth surfaces where they can graze on algae and biofilm. Their peaceful nature allows them to coexist well with other small, non-aggressive fish, making them perfect for community setups.

These catfish are sensitive to water quality and thrive in well-maintained aquariums with stable parameters. Clean water, gentle filtration, and regular water changes are essential to their health and longevity. Otocinclus are also sensitive to sudden changes in temperature or water chemistry, so consistency is key.

Diet for Otocinclus Catfish primarily consists of algae and biofilm, but they also benefit from supplemental foods. Algae wafers, blanched vegetables such as zucchini or cucumber, and sinking micro-pellets can help ensure they receive adequate nutrition. A varied diet promotes healthy growth and helps maintain their vibrant coloration.

Otocinclus Catfish are excellent algae controllers and contribute to the overall health and cleanliness of the aquarium. Their small size, peaceful temperament, and charming behavior make them a favorite choice for aquarists looking to maintain a balanced, planted community tank. With proper care, Otos can live up to 3–5 years, adding both function and beauty to any freshwater setup.

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