I had to look this one up. But the first link I found enticing is the one below. Looks like someone did a bunch of research already. Treatments, which there are a few, are almost halfway down the page. If I were you I would scan this page as there seems to be decent info throughout and not just read the treatments.
aquariumbreeder.com
One thought I had... Take those two out, treat the tank and start over.... But I understand wanting to save your little guys.
Good Luck!

Ellobiopsidae or Cladogonium ogishimae. Green Fungus in Shrimp Tank. - Shrimp and Snail Breeder
The parasite can be found on the body of the dwarf shrimp as “green fungus”. These organisms affect shrimp by causing distress and eventually death.

One thought I had... Take those two out, treat the tank and start over.... But I understand wanting to save your little guys.
Good Luck!