I only found this out because /r/DaystromInstitute got overrun with Tuvix posts and the mods had to temporarily ban them. Seems like this is not their first Tuvix rodeo.
@fraggle found this incredible gem
@fraggle Honestly, I do feel like they could have at least looked back on past transporter accidents and found a way to both restore Neelix and Tuvok AND keep Tuvix among the living.
But that would make sense in a show in which two crew members made lizard babies and then left them to die in an unknown planet.