sorry to hear about your ducks, I agree with twocrowsranch. Here are the links: http://www.backyardchickens.com/f/42/ducks and http://www.backyardchickens.com/f/10/emergencies-diseases-injuries-and-cures
I would post on this thread for best results: http://www.backyardchickens.com/f/10/emergencies-diseases-injuries-and-cures hope your chickens get better soon!
I second redsoxs's advice, make sure it is legal first so you don't have to get rid of your chickens http://www.backyardchickens.com/f/37/local-chicken-laws-ordinances-and-how-to-change-them