Hello, I am fostering abandoned domestic ducks that have been dumped in a local pond. I am replacing their old run, which was way too small for the three of them. I was planning to make their new run 10 feet wide and 20 feet long. I have two Pekin ducks and one welsh harlequin. Is this big enough run space for the three? I am not including their coop in that space. I’m talking about the space of the actual run only. Thank you.