Congrats on the Kribs; they are a great fish to keep! Krbis readily eat flake, pellet, frozen, and live foods. They aren't picky eaters. They are very suitable for a wide variety of water parameters, such as soft and hard. Somewhere in the middle is good, just keep the water clean and fresh through regular water changes. They prefer to have a space/cave/cubbyhole in the tank they can call their own, usually provided through rockwork, driftwood, or plants. Many use a flowerpot turned on its side.
Getting a pair usually isn't too difficult, but keep in mind, not all male/female kribs are compatible. If the male does not like the female, he will terrorize her. If the m/f gets along, they will both display very, very bright colors, particularly their bellies. Prior to breeding, their bellies will become beet red. The female will display to the male, and they m/f will usually hang out together. Eventually (there is no set timetable), the female will ready a spot in the territory that has bee staked off. She will lay eggs and the battle for the territory will become fierce. The male will adamantly defend it, while the female fans the eggs with her fins. During this time, the female usually won't eat, unless a stray bit of food floats by. After the eggs hatch, the female will stay with the fry. Until they are freeswimming, and sometimes later. They fry will eat algae, bit of "stuff" found in between the cracks of gravel, and bits of food that is expelled from their parents gills as they are eating.
Hope this helps
