Otocinclus Catfish

Otocinclus Catfish (Otocinclus spp.)

The Otocinclus Catfish, often simply called the "Oto," is one of the most effective and peaceful algae-eating fish available for freshwater aquariums. These small, hardworking catfish are highly prized by planted tank enthusiasts for their ability to graze on soft algae and biofilm without damaging delicate aquatic plants. Their gentle nature, compact size, and constant activity make them a valuable addition to community aquariums of all sizes.

Native to the rivers and streams of South America, Otocinclus Catfish spend their days attached to plant leaves, driftwood, rocks, and aquarium glass, methodically grazing on algae and microorganisms. Unlike many larger algae eaters, Otocinclus remain small and are completely plant-safe, making them ideal for aquascapes, nano aquariums, and heavily planted displays.

Otocinclus are social fish that thrive when kept in groups. Larger groups help them feel secure and encourage natural behavior. While they are excellent algae grazers, they should not be relied upon solely for aquarium maintenance and benefit from supplemental foods such as algae wafers, blanched vegetables, and specialty herbivore diets.

Scientific Name: Otocinclus spp.
Care Level: Easy to Moderate
Temperament: Peaceful
Diet: Herbivore / Algae Grazer
Adult Size: Up to 2 Inches
Minimum Tank Size: 10 Gallons
Origin: South America
Plant Safe: Yes

If you're looking for a peaceful and highly effective algae eater, the Otocinclus Catfish is an outstanding choice. Its hardworking nature, small size, and compatibility with planted aquariums have made it one of the most popular cleanup crew fish in the freshwater hobby.