Scott
I found microworms a good food for them in the beginning, the fry are really small when first hatched.
Edit
Scott
The eggs take roughy three days to hatch and the fry become free swimming by around the fifth or sixth day (once they use up there egg sack), you do not need to start feeding until the fifth day for any quick devolpers, feed them a little two or three times a day.
I assume when you say fry saver it is a self contained container, ie, a margerine tub or a small tupperware box (both are ideal) ?
You need to daily water changes on the fry saver, using mature water from the pairs tank.