Well, would it?? I mean adult ones. I have little doubt they would enjoy snacking on the fry, shoud there be any - but with adult Endlers being pretty tiny, would they at risk too?
No, they wouldn't - and I'm surprised they ate those neons (are you certain they were to blame?) unless the neons were immature. Having said that - let's clarify that they must be fully grown endler's, young ones will get eaten - anything that'll fit in a pearl's mouth is at risk.