Dr. Endler argues that the species he took samples of was in fact a seperate species, but that all of what we see in pet stores today are some form of hybrid. So either way, it's gotten to the point that it doesn't really matter. What I find in pet stores as endlers are either a form of guppy, or guppy hydrid (most likely). I'm probably just going to get feeder guppies anyway... is it probable that endlers would have a lower rate of infection? I'll pay extra to get the pretty ones if it will help keep my angels safer.. either way, they'll be qt'd for a month, and then bred.