I have heard of situations where the birds need to be treated - I am not discouraging that if necessary.
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This happened once, and no, I just pulled out all the bedding, tossed that straw bale, put DE in all the crevices, I think I wiped the floor with neem, and replaced the bedding. I checked the ducks and did not see mites on them - just saw them in the bedding.
That seems to have cleared it up. And I do spend loads of time with the ducks and have seen no evidence of mites in the meantime.
I know the little things are around, in the environment. but the DE seems to keep them at bay so far. I also put DE in the cracks between the floor and the door sill.