Lungless salamanders with rotting feet and dying

I have had one dead Eurycea bislineata over the past weeks and one dead Desmognathus fuscus (different tanks) last week. With the dead Eurycea I didn't notice anything specific, but she was decayed (she died in the water and I didn't notice it for a few days later) With the Desmognathus I noticed that she could not move her legs at some point and that she had lost all of her toes, she died a few days later. This morning I noticed a Eurycea with a back foot that had rotten away too and he did not use it in a proper matter. I isolated this animal this morning before I went to work and put him in a small container with moss with Esha 2000 sprenkled over it.
What can I do to help this little critter???!!! And what should I do with the other inmates and tanks (Desmognathus and Eurycea) since I do not know if the others have catched this disease already.
So far I haven't seen anything wrong with the Cynopses and Pleurodelesen.