Ok. Those little white dots were most likely ich(if you don't know what it is look it up in disease forum). How long ago did the white spots go away, and what did you do to make them go away? Treatment for ich usually should be continued at least a week after the spots leave. Make sure your water parameters are all good. Fish usually won't eat when they are sick or stressed, so first thing you have to do is correct your problem(whether it be ich or parameters). Don't worry if they don't eat for a few days. Just keep trying to feed small amounts, and remove uneaten food, until they start eating like normal.