The
Goldfish will probably eat all of the
Guppy fry..
Theoretically, the guppies could survive with enough plant cover... but since
Goldfish shred/eat/destroy plants, I wouldn't count on any guppies surviving...
Then again, with the right setup, in 5 months... lets see how many guppies from 7.
Startup
1 male- 6 females-
Month 1
1 male- 6 females, 60 fry
Month 2
1 male- 6 females, 60 juvies 60 fry
Month 3
23 males- 36 females, 60 juvies, 360 fry
Month 4
55 males, 66 females, 360 juvies, 660 fry
Month 5
200 males, 246 females, 660 juvies,
2460 fry
This is assuming, of course, a high temperature (about 80 degrees) and a healthy diet, along with lots and lots of aquariums and breeding traps. Also assuming 10 fry per pregnancy, which is a pretty safe bet.
Also, in about 80+ degrees, the fry would be old enough to mate and have young at around 2 months old.