Are these rosy red minnows? The father will protect the eggs until they hatch. Once born, both parents will try to eat them. With a large enough tank with enough cover (like dense live plants), a few may survive on their own. Otherwise, you would have to either remove the adult fish or remove the eggs and/or fry so that more would survive.
My rosy red minnow page -
http://www.fishpondinfo.com/rosies.htm