If you want to raise the fry, try to remove them before they are wrigglers. If you have time, get a breeder net and add a small airstone, adjusted with very little air bubbles.
I did this with my rainbows first spawn and they did fine. When the rainbows spawned again, I moved the 1st spawn and let them loose in my liverbearer tank. My mollies and platies did not eat them. The 2nd spawn were wrigglers within 2 days, free swimming 2 days after that. The parents had a hard time keeping up with them. Just before they spawned a 3rd time, they started eating the fry so I saved a few of the fry. I did this will their next spawn also. I never had to worry about what to do with all the fry, the parents took care of this naturally before they started to spawn again.
The rainbow fry I saved were all put in the liverbearer tank until the parents had their 4th spawn. Then I moved the juvies and fry back in with the parents, 18 in all. I'm still waiting to see if the parents even want to spawn anymore with all the fish around.