I feed twice a day, once right when the lights go on, and again right before the lights go off. Usually Hikari Sinking wafers and whatever Tetra Pellets they can steal from the neons and sidthimunkis. They fast on fridays and mondays, and saturday everyone gets a treat of some bloodworms. Giving them one or two days of fasting is something that is recommended on the "I Love Corydoras" website and i've also heard it from a few others as well.