guppy eating fish

I want to try my hand at breeding endlers, but I realize after I get them I'll prob soon be over-run with fry/adults, and I'd like the culls to go back into the chain of life.

Any suggestions on "guppy" eating fish that can live in a minimum tank size and able to breed easily as well?

Convicts have been suggested to me, but I've heard horror stories about not even pet shops taking them because they are too common.

Angelfish get dinner plate sized I hear and need lots of room. I'm trying to keep tank size to a minimum.

I've done research on the net until my eyes are blurred, so I'd really like to hear from others.