Otocinclus Catfish, commonly known as “Otos,” are small, peaceful freshwater catfish prized for their excellent algae-grazing abilities and gentle temperament. Perfect for planted aquariums and shrimp-safe community tanks, Otocinclus help control soft algae while adding subtle movement and interest to the lower and mid levels of the aquarium.
With their streamlined bodies, sucker-style mouths, and calm nature, Otos are ideal for aquarists looking for a natural, non-aggressive algae-eating fish. They are especially popular in aquascaped tanks where chemical algae control is undesirable.
Otocinclus Catfish are shipped at approximately 1–1.25 inches, a hardy juvenile size that adapts well to established aquariums. Adults typically reach 1.5–2 inches in length.
Otocinclus thrive in stable, mature aquariums with clean, well-oxygenated water. They do best in planted tanks with plenty of surfaces for biofilm growth. A gentle current and consistent water parameters help ensure long-term success.
Temperature: 72–80°F (22–27°C)
pH: 6.0–7.5
GH: 3–12
Tank Size: 10+ gallons (larger tanks recommended for groups)
These fish should always be kept in groups of 4–6 or more, as they are social and feel more secure in numbers.
While Otocinclus are known for eating algae, they require supplemental feeding to stay healthy. Offer algae wafers, spirulina-based foods, blanched vegetables (zucchini, spinach), and shrimp-safe prepared foods. A varied diet is essential, especially in very clean aquariums.
Otocinclus are extremely peaceful and compatible with a wide range of tankmates, including:
Tetras, rasboras, and small rainbowfish
Corydoras catfish
Dwarf shrimp (Neocaridina and Caridina)
Other non-aggressive community fish
Avoid housing them with large, aggressive, or fast-feeding species that may outcompete them for food.
Scientific Name: Otocinclus spp.
Common Name: Otocinclus Catfish, Oto
Shipping Size: ~1–1.25 inches
Adult Size: ~1.5–2 inches
Temperament: Peaceful
Diet: Herbivore / algae grazer
Swimming Level: Bottom to mid-water
Schooling: Yes (groups recommended)
Lifespan: 3–5 years
Otocinclus Catfish are an excellent choice for aquarists seeking a natural algae control solution that is safe, peaceful, and visually unobtrusive. When kept in proper groups and stable conditions, they become hardy, active, and highly beneficial members of a freshwater community aquarium.
Otocinclus Catfish, commonly known as “Otos,” are small, peaceful freshwater catfish prized for their excellent algae-grazing abilities and gentle temperament. Perfect for planted aquariums and shrimp-safe community tanks, Otocinclus help control soft algae while adding subtle movement and interest to the lower and mid levels of the aquarium.
With their streamlined bodies, sucker-style mouths, and calm nature, Otos are ideal for aquarists looking for a natural, non-aggressive algae-eating fish. They are especially popular in aquascaped tanks where chemical algae control is undesirable.
Otocinclus Catfish are shipped at approximately 1–1.25 inches, a hardy juvenile size that adapts well to established aquariums. Adults typically reach 1.5–2 inches in length.
Otocinclus thrive in stable, mature aquariums with clean, well-oxygenated water. They do best in planted tanks with plenty of surfaces for biofilm growth. A gentle current and consistent water parameters help ensure long-term success.
Temperature: 72–80°F (22–27°C)
pH: 6.0–7.5
GH: 3–12
Tank Size: 10+ gallons (larger tanks recommended for groups)
These fish should always be kept in groups of 4–6 or more, as they are social and feel more secure in numbers.
While Otocinclus are known for eating algae, they require supplemental feeding to stay healthy. Offer algae wafers, spirulina-based foods, blanched vegetables (zucchini, spinach), and shrimp-safe prepared foods. A varied diet is essential, especially in very clean aquariums.
Otocinclus are extremely peaceful and compatible with a wide range of tankmates, including:
Tetras, rasboras, and small rainbowfish
Corydoras catfish
Dwarf shrimp (Neocaridina and Caridina)
Other non-aggressive community fish
Avoid housing them with large, aggressive, or fast-feeding species that may outcompete them for food.
Scientific Name: Otocinclus spp.
Common Name: Otocinclus Catfish, Oto
Shipping Size: ~1–1.25 inches
Adult Size: ~1.5–2 inches
Temperament: Peaceful
Diet: Herbivore / algae grazer
Swimming Level: Bottom to mid-water
Schooling: Yes (groups recommended)
Lifespan: 3–5 years
Otocinclus Catfish are an excellent choice for aquarists seeking a natural algae control solution that is safe, peaceful, and visually unobtrusive. When kept in proper groups and stable conditions, they become hardy, active, and highly beneficial members of a freshwater community aquarium.
