I would change all water daily and clean coop daily. Breathing poop can’t be good for them, also is the drake over mating the females? I am terrible sorry for you.
i Will today - they all quak but like when we hold them to bring in at night ( we have them sleep in a living room in a big stock tank with the chicks) or at night they like to eat and talk. But during the day not so much.
we have two peking ducks and the three ducks actually raised 6 chicks also (got them all from tractor supply) the chicks think they are ducks kinda cute. they are like one unit and the other chickens we have are another. Do you think its a female? Def not lonley. Unless the rouen needs another...