[Aussieman57]

Never tried this but they do well in hard water and can tolerate higher pH. They tend to like the middle and top layers of the tank but will venture to the bottom to burrow and look for food. They also appreciate plants in the tank. The big issue is their inability to protect themselves from aggression. I'm thinking the shell dwellers will pummel the Endlers so I would not combine them.

 

[Aussieman57]

Will the Shellie’s eat the baby endlers? Or will I have to worry about the endler eating all of her babies? What do I do with the pregnant endler?

You could just leave them be and let nature take it's course. If you really want to raise the baby endlers there are "guppy breeder traps you could place the mom in. Do you have an extra tank to raise the endlers?