I just purchased two swans for my pond, there is a fountain in the middle with lights, there is an open area about 30 ft in diameter, the swans are still in my garage where they are safe. It is my understanding that they have to be feed in the water, that they will not leave the water and walk across the ice to eat their corn. What should I do? I am afraid to turn them loose until i know how to feed them. Thanks Ron