Update:
I've had a couple more batches of eggs since the first. There were 3 survivors in the first batch, and a few from the second. I've counted somewhere between 9 and 11 babies still in the breeder box, it's hard to tell. Last night one of my giant mystery snails climbed in with them. Haha. I'm hoping no one got eaten...
Then tonight, I was looking in the tank, and saw a mystery baby on the glass. I'm thinking maybe an oto? He's too tiny to tell, but I stuck him in the box with the rest, I'm hoping he sticks around.
It's not a great picture, but you can kinda see the one cory fry up front, and right behind him is the mystery fry.