[Live bearer stomach are exploding]

43 minutes ago, TomO said:

Yes, but they always eat the stomach first?

 

I think it's very unlikely that they are physically exploding, if they were unable to poop or eating to death they would bloat up and look like they have dropsy, not burst. 

 

44 minutes ago, Colu said:

Snail and fish always eat soft part of body such as eyes and Stomach

This is my experience as well.

[Live bearer stomach are exploding]

Sounds like they are dying from other reasons and are being eaten, a picture if another one dies would help. Any signs of illness or odd behavior before they die?