Hi
Kept Mandarins as a kid.
They lived with my bantams, however if you want to breed them, then best to house them seperatly, so the female isn't disturbed on the nest. Can run out with the chooks.
They don't quack, they whistle & in eclipse plumage, both male & female look alike. The male will have orange feet, the female brown or yellow ?
They like a pool, will need one for breeding, any ducklings will need pinoning as they are good flyers, being tree dwelling ducks in the wild.
In the wild they brred in tree holes, but a nest box supplied with something like hay will be fine.
They make great pets, bit nervous sometimes, but hardy little ducks. Small white eggs as I remember.
Hope this may help.