OK, (good guy) Albert, but hard to tell when you're joking sometimes (as when I first read your "hypothesis")...

I get it, you think I'm an idiot. We don't have to interact.

Oh come on, Albert, you know that isn't true. Very much the opposite, actually, as I well know and appreciate your experience and knowledge. And I wouldn't have razzed you if I thought you would be offended. My apologies...

:lalala:

:pop2::drinking:

lol

If the fish one has left beat it and seem to be immune, how long until you can add new fish. Can it hang around forever? Will my immune fish still carry the parasite? And so forth.

I can't read back through all that mess, so I'll pick up here. If you had a fish exposed, and not treated that appears to have developed an immunity, I would not add other fish to the tank with it.
Remove it, treat it, and leave the tank for 3 months. Then add newly QT'ed fish to the system.

Good grief. Thats sucks. Maybe I will just keep the few immune fish. Im going to read your thread again.

I curse who ever gave this to my fish. I have had flatworms and fish die but nothing like this. Its enough to drive one from the hobby.