Is this Molly pregnant?

TheNacho

I got 2 new females a month ago. One of them (Don't know which, didn't notice anything until the babies were already born) gave birth a week ago or so.

Now one of them, I'm assuming the one that didn't give birth, looks significantly fatter than the other new molly. She doesn't seem to be resting much, but she's very skittish recently and darts any time I approach the aquarium.

(No males in the aquarium, only 2 other mollies that are also female)
Is she pregnant? If so, when should I isolate her so she could give birth privately?
 

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Ouse

Even if there are no males in the current aquarium, the molly could still be pregnant from the shop. Female livebearers can store sperm for up to a year. Unless a female has been in a tank without males for a long time, you can always safely assume she’s pregnant. The gravid spot isn’t visible in this fish, but still.

Personally, I see no need to isolate. By isolating the mother you’re biting off more than you can chew in the sense that you’ll end up with more fry than the tank can handle. If you don’t isolate the mother, one or two fry will likely survive anyway; I have a platy fry who is growing up besides four fully grown platies. This has happened to me three other times before.

Baring in mind female mollies are almost perpetually pregnant, raising every fry you see will overwhelm.
 
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