Algae Eater Otocinclus Catfish (3-4 cms) | Single

The Otocinclus Catfish (commonly called Otos or Dwarf Suckermouth Catfish) is one of the most popular freshwater algae eaters for planted aquariums. Peaceful, hardy, and effective at controlling algae, Otos are an excellent choice for community tanks and nano aquariums.

• Size: Up to 2 inches (5 cm)
• Lifespan: 3–5 years
• Temperament: Peaceful, schooling fish
• Diet: Algae, biofilm, vegetables, algae wafers
• Minimum Tank Size: 10 gallons (larger recommended for groups)

Appearance

Otocinclus Catfish have slender, torpedo-shaped bodies with a light brown base color and darker horizontal stripes or spots. Their unique suckermouth allows them to scrape algae from aquarium glass, plants, and decorations.

• Peaceful and social; best kept in groups of 5 or more
• Constant grazers, spending most of their time cleaning algae
• Compatible with shrimp, tetras, rasboras, and other small peaceful fish
• Avoid housing with aggressive or predatory species

Diet & Feeding

• Primary diet: soft algae, diatoms, and biofilm
• Supplement with algae wafers, blanched zucchini, cucumber, or spinach
• Require consistent access to algae in a mature aquarium
• Temperature: 72–78°F (22–26°C)
• pH: 6.5–7.5 (slightly acidic to neutral)
• Setup: Planted aquarium with hiding places and moderate water flow
• Thrive in mature, stable tanks with good water quality

Care Tips

• Very sensitive to poor water conditions → regular water changes and filtration are essential
• Best introduced into established aquariums with natural algae growth
• Keep in groups to reduce stress and encourage natural behavior