I always had peppered cories with freat success :)
Who am I? Well I am a Junior Member of the International Betta Congress and a breeder of white HMPKs, red dragon HMPKs, black/red dragon HMPKs, metallic multi HMPKs, blue masked HMPKs, and now multi color HMs. Soon to add black HMs. I will be showing in New Breeder class in fall of 2012.
My Otos didn't do well with one of my females. Do the cories just do better with Betta?
It depends on the size of a tank. Cories are actually great with any fish because of their nature, they love to just swim at the bottom of the tank looking for food. Literally their entire life span they will spend most of their time foraging. Sometimes they will swim to the top but mostly their bobble at the bottom. just make sur eyou have a soft gravel or sand substrate so they don't get hurt. also you need 3 or more cories because they prefer to school