Macrotocinclus affinis

Macrotocinclus affinis
Golden Otocinclus
The golden oto (Macrotocinclus affinis, formerly Otocinclus affinis) is one of the smallest known suckermouth catfish, often called a 'dwarf oto'. Typically found in Southeast Brazil, this herbivorous, rheophilic, bottom-feeder only grows to around 4 cm (1.6 in) in length. These small fish are often used for the purpose of controlling algae in small home aquariums.
M. affinis is a Batesian mimic of Corydoras nattereri. Due to its narrow stripe, O. affinis resembles this Corydoras species more than it does Otocinclus species.
M. affinis prefers an aquarium with fast moving water, sandy substrate, and plenty of hiding areas. Preferred pH is slightly acidic with a tank temperature of 22–28 °C。 This particular species is not as hardy as many of the other Otocinclus species.