@Lackey84 It has to do with so many aspects of duck life there seems to always be an under dog. It has nothing to do with your set up most likely.
Hopefully it was just a one time thing and once you put the blue kote on it will not happen again. Now if you want to see some serious dominance you need to come here. lol
I have a Muscovy drake and an Embden gander who most of the time live closely with out incident until Hormones kick in with the gander it's in Jan each year he pushes the drake around nothing serious because the drake stays out of his way, then come May things begin to change the drakes hormones are at full speed ahead and the ganders are winding down for the year, so 2X already this week I have had to go out and get my drake off my ganders back literally my gander is running around with a huge Muscovy Drake on his back because the drake doesn't let up. So they have to be kept separate from here on out till fall when the Muscovy starts to settle down again. Whew. Always interesting when you have birds.
Oh and FYI Blue kote in the dauber is much better than in the spray, and make sure you have on old clothes before applying it turns anything it touches purple. That I why is is so awesome to use on birds injuries it totally disguises the wound.