This can point to a major fish killer, the one i am talking about is STRESS... yes that evil thing, see fish can drop dead from stress and not show any sign of it, and the number of things that can stress a fish is so big you will find it hard to find out what went wrong, Now i can offer a few suggestions, but to get a better understanding, we need to know your tank levels, what fish are in the tank, what hardware you are using, lighting? any plants, real of plastic, filtration
Basically from general, if it is a fishes first batch, well you can understand, because thought fish are different from humans they can act just like us... and you know women hate their first baby... because it is so painful, that can stress out the mother...
Or there could be a fish harassing her and she could take anymore..
Fish can abort birthing at the last possible moment and it is the worse thing that can happen to a fish keeper...
This is a mind puzzeler, but with more information on your tank and E.Q we might be able to pinpoint out some sort of problem that could have caused this...
I had a male guppy that was swimming around perfectly one day and i go out and buy two females for him to find him dead, no visable illness, perfectly healthy apart from the fact of being dead, so i basically know how it feels to lose fish this way
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)