If you are having problems with bugs in your keets food, you can freeze it when you bring it home. Be sure to throughly wash the container that you put the food in.
You brought the moth home with you from the store. This is why I never buy from bulk bens in the store. I know it is cheaper but once they get mothes in their food it is impossible to get rid of.
Good luck with your pest problem. Sometimes they can be quite frustrating.