Set them up with preferably more males than females ( a ratio of 2:1 is good ) in a 18" x 12" x 12" tank with either fine gravel or sand with either sponge filter or a corner filter box with a good current. Install some java moss or wool mops, this gives the females a choice of where to place their eggs but you will probably find that they will mostly lay them on the glass anyway. A temperature in the mid-seventies is good with a p.H around about the neutral (7) mark. Feed a diet of frozen or live food such as bloodworm, whiteworm (sparingly because of the fat content) grindleworm, daphnia and a good quality flake or tablet food. Make a 50% water change, when you notice the female(s) have fattened up, with water that is cooler so as to bring the temperature down. A good idea is to also add a small internal filter to push the water around the aquarium which will also oxygenate it. If successful you can either take the adults out and leave the eggs in the main tank or reverse it and take the eggs out by rolling them of the tank sides with your fingers into a small hatching tank, you can then decide to add a anti-fungus remedy or to leave alone. If you make the wrong choice and the eggs fungus you will get another chance as once Corydoras start to breed the first time they will carry on using the afore-mentioned process. See further information in this ScotCat article An attempt to spawn upon demand?