Corydoras aeneus, aka the Bronze, Green, or Aeneus Cory, is one of the most widely available catfish in the aquarium hobby. Like all cories it does best when kept in groups of at least 3-6, and fares best on a soft substrate as opposed to gravel. These incredibly peaceful catfish will not bother any tankmates, short of perhaps eating eggs or fry.
These are young adults, around 1.25-1.5" long.