Sounds like premature babies. Shame on you for stressing the mummy out
Keep the babies with yolk sacs in a breeding trap or icecream bucket in the tank. Don't remove them from the water just use a small container to scoop them and the water up. The other babies that look like little versions of their parents (without the yolk sac) can be housed in another breeding trap or tank. Some of the more developed yolk sac fry might survive. It depends on how well developed they are. The one that still looks like a ball is probably doomed.
If you use an icecream bucket to hold the fry change some of the water with the tank water several times a day. You can aerate the bucket but only very gently. A tiny bit of water movement can help but you do not want the fry being knocked about or rolling around the bucket.