of course, the stronger, smarter fish survive while the ones with defects or weaknesses are eaten, and cant pass on there genes. (until of course, we interfere and sometimes begin weakening the fishes through bad breeding).
anyway, if you have the babies in one of them live bearer hatcheries (which is what it sounds like) then the babies will be ok. return the female back to the tank.
if you don't, and the female is in the main tank; presuming you only got a community tank or one tank only, with enough cover you will have 5-10 babies survive, which is plenty for a single tank.
if your serious about breeding them, do a bit more research
