Great set up for them. And glad you got the b complex and activated charcoal.
Here is info on giving pills to poultry
https://www.backyardchickens.com/threads/how-to-give-pills-to-ducks.1246505/
Here is info on giving pills to poultry
https://www.backyardchickens.com/threads/how-to-give-pills-to-ducks.1246505/