Cocci in ducklings??

[mamalynnx]

I got my first order of ducklings today. A cayuga trio and a pair of welsh harlequins. 4 of the 5 are doing really well. My welsh harlequin male is not. He has bloody feces and that sorta haunched over posture, holding his wings up. He seems very uncomfortable and lethargic. He has been eating and drinking but not often. I know ducklings don't typically get coccidia and it seems strange to me that he just hatched and arrived and here he is quite ill. I'm a newbie to this though so I don't know?? I'm wondering what to do here. Do I treat him for coccidia? Should I treat them all since they all shipped together? I've been keeping their brooder clean and changing the water often to try and keep the chances of spreading down but they may already have it. Do I put them on medicated feed and something else as well? Any advice is greatly appreciated!