FEMALE GUPPIES KEEP DYING.?

I pretty much agree with what Mark said on your post. Except, cory cats are sensitive to salt, so I would just cut it out completely. It may over time affect them, and even kill them. I'm also not a fan of salt in the tank anyway, unless you're treating for parasites or nitrites in the tank. Guppies don't have to have salt, no livebearers do. Mollies can be adapted to brackish water, but can tolerate fresh as well.

I also think it's something specific to the guppies. Maybe they're having a problem-possibly even genetic related, while giving birth to the fry. You got them from different places, so that almost rules out a bad batch. You could check with the stores and make sure they all use different guppy breeders. It may be they're all using the same person for their guppies. Try adding a few more females, but get them from a completely different source if you can. Good luck!

do you have a clear out? how massive is your tank? do you have a heater? do you upload cemicals? what number fish do you have now? what number fish died? the place did you get them? did you have adult males and then upload women? what became their homestead like in the past you get carry of them? became it clean? did it have any lifeless or ill fish interior the tank? oh i might desire to flow on for years asking those questons so we choose greater information then we are able to help. yet i do have one theory. if yo further the girls when you further the lads then they might have had a disese that would desire to no longer be exceeded on from fish to fish. idn