HELP NEEDED - Staggering, dying ducklings

[Cottage Rose]

Hi Ethan.

Glad things aren't getting worse.
There aren't a lot of domestic waterfowl diseases but I am sure both geese and ducks would get the same diseases.
I wonder if it was mold or some kind of toxin in the sand??

 

[Duck Keeper]

When I had hermit crabs, we put them in playbox sand, and it grew mold like CRAZY when it got wet!

I just remembered this, so DON'T put them on sand any more! Ducks and geese love water, and so does mold.

It was white, with litte black spots all over. It smelled kind of musty? It's been awhile.