I've been trying to breed guppies for a while. I had more than 10 guppies successfully delivered their babies, but the mothers always died not long after.
Any idea why? What should I do to prevent this from happening again in the future?
Cheers,

+++++++++++++++++++++++
200 Lt (5 Ft) Tropical Fish Tank with:
5 Silver Dollar
6 Kribensis
2 Pearl Gourame
2 Gold Gourame
1 Silver Shark
80 Lt (2 Ft) Freshwater Fish Tank with:
2 Blue Yabbies
40 Lt (1 Ft) Tropical Fish Tank with:
Baby Guppies
Baby Mollies
Any idea why? What should I do to prevent this from happening again in the future?
Cheers,
+++++++++++++++++++++++
200 Lt (5 Ft) Tropical Fish Tank with:
5 Silver Dollar
6 Kribensis
2 Pearl Gourame
2 Gold Gourame
1 Silver Shark
80 Lt (2 Ft) Freshwater Fish Tank with:
2 Blue Yabbies
40 Lt (1 Ft) Tropical Fish Tank with:
Baby Guppies
Baby Mollies