The Otocinclus Catfish (Otocinclus sp.) is one of the most popular and effective algae-eating fish in the planted aquarium hobby, originating from South America. These small, peaceful catfish are tireless grazers of soft green algae and biofilm, making them an invaluable addition to planted tanks where they work quietly and efficiently without disturbing plants or tankmates. Best kept in groups, they are social fish that thrive when not kept alone.
Care Guide
Tank Size: Minimum 40L; best kept in groups of 6 or more
Water Parameters: pH 6.0–7.5 | Temp 22–27°C | Soft to moderately hard water
Diet: Herbivorous — soft green algae and biofilm; supplement with algae wafers, blanched zucchini, spinach, and cucumber
Temperament: Peaceful; excellent community fish — safe with all plants and invertebrates
Tank Setup: Planted aquarium with smooth surfaces, driftwood, and gentle flow; avoid strong currents
Skill Level: Beginner to Intermediate (sensitive to poor water quality)
