Actually, the fountain will keep the swans and the pond healthy. By aerating the pond, harmful anaerobic bacteria that can cause the deadly toxin, botulism can be prevented. We can't imagine that the fountain would be so large that it prevents the swans from being able to swim. The swans just need to get used to the new addition to the habitat and they will not only swim but may start playing in the showers produced by the fountain. The Regal Swan