It's best to keep snakes on f/t mice, as mice can be dangerous to a snake, regardless of size, when being fed in captivity. They could bite the snake, scratch an eye, or break the jaw of the snake.
With the plethora of questions that I have seen you post, I would strongly advise you to read some care sheets on corn snakes, as well as The Corn Snake Manual by Bill and Kathy Love. You can also search forums for past threads concerning your questions at the bottom within a forum. Look for "search this forum", and type in some keywords. Good luck.