The virus is not curable. Not sure how to distinguish virus from wound. I mean if he has other symptoms of the virus then he has the virus but if he doesn’t and just has that one lesion then it’s just a wound.
Looks like a Red tail Notho Killifish to me. Here’s a comparison pic. Might not be this exact species but I definitely think it’s some type of killifish.
I would inspect them on the spot. See if they need to be resealed, see how dirty they are, that sort of stuff. I doubt he’s a liar but just check that sort of stuff just to make sure...
I watched finding nemo in class and the whole time I was pointing out mistakes. I don’t know if he was annoyed with me or surprised that I knew this stuff.
I’m 99% sure it’s contagious. I might be wrong though... Like I suggested above use a plastic tub for a temporary hospital tank. Do daily water changes as well.