Ok, correct me if I'm wrong, but...
Isn't "Neon Tetra Disease" also called "columnaris"? I have seen cardinal tetras, serpae tetras, dwarf neon rainbows, threadfin rainbows, etc... all die from columnaris. I have also seen it cured. It's a nasty, nasty disease, but it can be stopped...
Hope I have my facts straight!
Squeeker