Otocinclus

Species/genus: Otocinclus affinis
 
Origin: Southeastern Brazil
 
Temp: 68 - 73°F (20 - 23°C)
 
pH: 6 - 8  dH: Not Critical
 
Temperament: Very easygoing
 
Adult Size: 1 1/2 in (4 cm)
 
Minimum Tank Size: 2 gallon
 
Feeding: Eats primarily algae, will consume flakes and other normal fish foods in a pinch
 
Breeding: Similar to Corydoras
 
Comments: A nice fish to have if you have any problems with algae.
 
It is harmless to other fish.
 
Note it's preference for low temperatures.