Cories are very active catfish, that act as scavengers in the tank bottom. Very good for communities. They constantly forage for leftovers but this should not be their primary diet. You should get sinking pellets and feed at night, when the cories are most active. They should be kept in atleast groups of four as they are very social. Almost like mini plecos that only get a few inches, and instead of algae eating they scavenge for leftovers. Only name i really know is corydoras catfish. But their are many different variations.
Anyway Good luck,
Daniel