All of the above mentioned live foods are good. Do some research on how to keep the different types of live food first though. For example, for white worms, you absolutely need to have a cool place year round to keep them. My container does will on the concrete floor in my unheated basement, black worms require refrigeration and daily rinsing with chilled chemical free water. Frozen bloodworms (Hikari brand) are always a hit and although not live, are an excellent conditioning foor for breeding cories and they go nuts for them. You would just need to "shave" off the frozen cube before feeding for the appropriate size for the dwarf cories mouths. When I bred pygmaeus cories that's what I fed them for conditioning food.