All male ducks! Any risks of an all male flock?

[ElPatoPalace]

Can you believe it, I bought 4 ducks and they are all male, what are the odds!?!? Does anyone have any experience with having all male ducks? Specifically have you found there are any issues or concerns with having all male ducks? I've noticed now that they are adults (6 months old) they are wanting to mate but a bit confused since they are all males. Part of their morning ritual is bathing in the swimming tub which is usually prime mating time. I understand duck mating can be a bit 'rough' but when its all boys I worry can it be too rough? Does anyone have any experience with all male ducks and were there any issues you ran into with having an all male flock?
I've attached a video of their morning bath time and the mating 'confusion' they practice daily.

I dont plan to continue to have all males as we got our ducks for eggs. However, we are moving in a few months so waiting until we relocate to more land before adding some females to the group. So, I just need to know if my boys will be ok and wont harm each other between now and the near future.

 

[Virus]

I would think about putting them in different runs. Some other people who raise ducks have told me stories about their males killing each other by doing this. They can seriously hurt each other by doing this so I'd either out them in different places, get females really soon, or at the very least don't let them all bathe at the same time.

 

[Vosh Sahaal]

Some places use large all Drake flocks for quite pest elimination. The trick is to have them spend between one day a week and one day a month in a dark room. This throws off their hormones and mellows them out.