If you're leaving for 2 - 3 days, you shouldn't have taken the male out. Fry reaching free swimming stage indicates that he is not an egg/fry eater. His presence would have helped the fry to some extent while you are gone and someone inexperienced takes care of them. Well, that's too late now.
Just have someone give them a couple of pinches of egg yolk scattered evenly throughout the tank twice daily (if you have a small spray, even better). And if you have live tubefix, put in about the amount of a thumb scattered around the tank. They probably can't eat the worms but can nibble on .... not sure .... worm or other micro organism from the worm. You can also put in some live daphnia and hope that they will reproduce so fry can eat their offspring.
When you return, do a massive wc very slowly. Refill tank by using air line tube slightly plugged with a chopstick or something. Or 2 50% wc, 1 in the morning and 1 in the late afternoon (refill the same way). And at the same time, prepare what ever fry food you have to feed asap. So make sure you prepare new water before you leave and let it age until you return.