The Cory Catfish (or Corydora catfish) is a small, peaceful, shoaling species of catfish. The Bronze/Green corydora has a dark iridescent green/bronze hue to it's back.
Cory catfish do best in water temperatures in the mid-70's. A minimum shoal of 3 should be kept for this animal's wellbeing. Three corydora can generally live well in a 15-gallon aquarium (though a shoal of 6+ is generally preferred, and should be kept in a 29-gallon aquarium). Most cory catfish will reach 2" in length when fully grown, and live to be 4 years old on average.
It is important that these fish are kept on a sand substrate (or very fine gravel). Corydoras enjoy sifting the substrate through their barbels; that said, if your substrate is too large or sharp, these barbels can break off and lead to infection. These fish are very sensitive to poor water quality. Do not add corydora to an aquarium that is not fully cycled.
Cory cats will eat essentially any foods that fall to the bottom of the aquarium, and are very efficient scavengers and bottom feeders. These fish are extraordinarily peaceful and can be kept with any species of community fish not inclined to harm or eat the corydora. They can easily live with other peaceful bottomfeeding animals.
(Photo credit "Wikipedia")