Don't worry if you can't find them because there always will be more but if you manage to find them before they're eaten just put them into a net in the main tank for them to grow a bit. Or even better I made a large fry net just out of some netting from the craft store and worked a treat until I had a tank free to move the fry into
I had my first guppy fry today. They are in my 15 gallon qt tank. I moved out the 2 remaining guppies to my main tank..leavings babes and Mom in the small tank. Tomorrow...when Mom should be done I will move her to the large tank. In the meantime I have several fake plants and guppy grass, and made a yarn mop. I went this route as I decided I could never find and net the fry. We will see how it goes. Counted 7 fry earlier and only 4 an hour ago. They move super fast and like to hide. Good luck to you.
A turkey baster will suck them up when you see them. but be warned they will continue to reproduce so unless your looking to do a lot of tanks your better off letting nature take its course and let the strong survive. Not the nicest thing to say but it's the way of life for guppy keepers.