If you had the same amount of males to females, or more males than females, the males could have stressed the females to death. I have about 20-25 adult/juvenile fancy guppies and about 10-15 fry right now...my guppies are (all but two or three) pregnant, as they usually are... i haven't found any fry for quit a while now..either because they get eaten by any other fish or sucked up in the filter... but anyways.... The ratio of females to males should be at least 2:1, preferably 3:1. My males were so aggresive i moved them into another tank,then had to move one of the bigger guys back, because he wasn't patterned w/ black, he was just a plain,vibrant yellow.. and all the other males were trying to breed w/ him because they thought he was a female...The males could have weakened your females and eventually killed them by their...persistance to breed...(i guess thats what you'd call it...)i would suggest haveing more females than males or separating them if possible...then when you want more babies you can just put them in together...
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