so their is 1 duck and 2 drakes? If so, not a good idea at all.. they will fight (the drakes ) and way overmate the female. Min 2-3 ducks per drake and some drakes that isn't even enough. I have 5 ducks with my pekin drake i knew enough from this board the pekin male can be overly aggressive sexually so i was thrilled when my ratio turned out like that(yes, it was a straight run lol)
Can more than 1 drake get along? yes BUT that takes massive balance.. and a lot of females.. in my free ranged flock i run several drakes but keep a lot of females and each spring can be a bit um, crazy especially as i decide which young drakes to keep for the new year...
That said some drakes don't work in multiple drake flocks, i sold one last year like that.. he just did not even as a young'in show a personality to do so. I tolerate NO drake going after me, ever! i have big drakes these are mostly Muscovy with huge claws, they could seriously hurt someone. Drakes who do not know their place act like this and that must be curtailed. I am top Drake in my flock, the birds move for me not the other way around, i am never unkind but have no trouble establishing my place.