I keep Fancy Guppies and have all the fish in the same tank. I've never separated them. To do this though, you need a lot of Anacharis and Pennywort floating in the tank. This gives the females and the new ones places to hide. Also, you need to feed frozen foods, often. You'll need to thaw the frozen cubes completely and pour the contents into the tank. If you keep the adults well fed, they show little interest in the fry and you have a high fry survival rate.
The males will show a little color at 2 to 3 weeks.
"Fear not, my young apprentice. Just change the tank water."