Oh my goodness I am so sorry, you are a good duck mama! And poor Max! It is so hard losing one of these sweet ducks. I lost one a few months ago and it is horrible. 

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Now I am just so over worried about Max that I have to ask.. from day one I have been able to hear him breath.. kinda like a stuffy nose but his nostrils ,I guess they are called ,are clear .. now I was never able to hear Ruby breath until Saturday and she had issues obviously but do some ducks just breath loud and some not? Sorry I am just a bit freaked out and you guys have all been so helpful I really appreciate itI hope he can hold out for a week or too. I understand what the vet is says though. Bless his heart. And yoursfor Ruby to be so young an possibly have cancer is so sad. Thanks for updating.
Now I am just so over worried about Max that I have to ask.. from day one I have been able to hear him breath.. kinda like a stuffy nose but his nostrils ,I guess they are called ,are clear .. now I was never able to hear Ruby breath until Saturday and she had issues obviously but do some ducks just breath loud and some not? Sorry I am just a bit freaked out and you guys have all been so helpful I really appreciate it
Yes he has access to nose deep water at all times and no open mouth breathing. Thank youI assume you are providing nose deep water 24/7. If he doesn't appear to be showing any other symptoms I wouldn't be concerned, I believe I had a Pekin that breathed somewhat hard most of her life, no open mouth breathing, just through her nostrils.