I have two very tiny Red-eared slider turtles, they're not eating and i'm not sure what to feed them?

My two turtles are tiny just barely bigger than a quarter and i think goldfish and worms would be too big for them so i'm not sure what to feed them, they don't like to eat their pellets. I'm worried I just got them and dont want them to get sick. I'm in the process of getting them a larger home (than what they came in, it was a spontaneous buy) but I don't know much about them besides they eat fishies and worms. any information helps!