It's now been several weeks since the fry are free swimming. I must say that I probably only have 10% of them left, but those 10% seem to be doing pretty well. I put a car-sponge on the filter intake early in the game so that the fry could peck food off of it and also so that they wouldn't get sucked in the filter. I've been doing frequent water changes from the main tank to the fry tank. I think that helped. I'll post updates as time progresses.
Also, leaving them with their parents is not an option. The parents tank is large, but it's got a bunch of faster smaller fish in it that love to eat fry. They wouldn't stand a chance. I typically just leave the fry with the parents when I don't have room for the fry anywhere else - knowing they'll get eaten.