New Fish Tank Tips: If you enjoy reading, go to the library or buy tropical fish books. Get a couple of books on aquarium information or the species you are interested in getting. Reading a book is probably the fastest way to get up to speed and it provides a great reference for the future. On this site you can find some of the fish books we’ve reviewed.
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Macrotocinclus affinis (formerly Otocinclus affinis) (“Golden Oto”) 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 one and a half inches in length. These small fish are often used for the purpose of controlling algae in small home aquariums.
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 70-80 °F. This particular species is not as hardy as many of the other Otocinclus species.