I don't have cories with them. Just ADFs and bettas. I would never put cories in with them, as they'd definitely not get anything to eat then. Cories move way too fast and gobble down the food. It takes the ADFs a little bit to find the food.
I have to syringe feed my ADF because the betta gets to the food first... but I have always had wierd bettas who end up becoming bottom scavengers.....