Will paradise fish kill mollies

Fish of the family Poecilidae, yes that includes Mollies, don't have the mouths to cause serious damage to each other, or other fish. They can peck at each other, but the worst that could happen is a guppy with a small rip in the tail. They can, however, eat fry. Fish of the family Poecilidae will spend more time showing off and "pushing" each other with their tails than actually fighting.