I rotted my paph roots

[oborchid]

I recently let a couple of fans in my greenhouse die, and waited too long to replace them. In the meantime, I am afraid that I allowed several of my paph's roots to rot. They are all in semi-hydro.
I pulled one out of the pot and it has no roots left.
Should I use the sphag n bag technique?
I have thiomyl, and I was thinking of drenching them all with it, and then following up with a dose of KLN.
Any thoughts would be appreciated.