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Hi I had a sailfin molly that had fri..
I had put her within the breeder 2 weeks ago and she just pooped, well after I scooped her out I saw these eggs and Mollys are live breeders.. what are the eggs? Unborn fish?

I have have Platies and swards and guppy fri biy not Sailfin mollies
As you said, mollies are livebearers and shouldn’t hold eggs. Yes, the eggs are unborn fish. She may have aborted the pregnancy due to stress. Check your water chemistry, river temperature, and anything else that may have affected her. I wouldn’t verbs about it too much, though. She’ll probably give birth again in nearly a month as they can store sperm for 3-6 batches without a male. =]
She probably had a miscarriage. Yes, Mollies are live-bearers, and therefore will deliver live fry. What you enjoy experienced with your Molly not delivering, is what happens when you put her within the breeder too early, she ends up literally absorbing the fry. You should not move her at all, just keep hold of the tank heavily planted, and once you see the fry populating your tank, only later, you can move them to a nursery tank. It is only people who are experienced near these live-bearers who can know exactly when their fish is going to deliver, IE, the next day, contained by the night, etc, who move their fish to breeder tanks, or nets. Good luck.
Answers:    Yes, these are likely unborn fish from a miscarriage.

I have never trusted the use of breeding nets or other breeders. It is far too small for most platies and mollies, and particularly too small for a sailfin molly. It is likely to cause stress, and therefore, the miscarriage. I know that some general public have had success next to these, but I never have.

The best bet is for future batches to go away her in the community aquarium, but provide lots of hiding places, plant cover, and especially floating plant cover. This will give her a place to administer birth in peace, and then a place for the babies to hide. Once you locate the fry, you can measure them out and put them in a nursery tank (if you have other fish plausible to eat them), or leave them in the community reservoir with plenty of cover.
She abort the fry because of the stress of being in one of those breeder boxes. These should NOT be used for expectant mothers.

By all method put newborn fry in but not the mothers. Instead put a dense plant or two like java moss to hide the fry until you can lattice them out.
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