NTD and Cardinals

I posted those pictures in my original discussion that gave rise to this question.

The truth it seems is not clear. However, I've conceded on the grounds that I can't prove my case.
 
I would be unwilling to state that any Tetra is "immune" to NTD. Degree of sensitivity or succeptiblity to the infection is highly debatable. I would not concede immunity without proof.
 
AquariaCentral.com