05-17-2011, 02:33 PM
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With two males and only female, she is most likely pregnant. That is normal to see the dark "gravid" spot, that just means she's female, not pregnant.
It takes about a month before the female gives birth.
You should consider getting another female or two, though. You should have more females than males, because the males can chase a lone female to death. In fact, I have three silver mollies, two male and one female, and I have mine separated in two different tanks for just that reason. Initially I had them all in with my 24k mollies, but the silver males wanted nothing to do with the 24k females. As for fry, the best thing to do is have plenty of hiding places for them, such as java moss. My fish still eat the silver babies though, I think because they are so white and easy to see. I wouldn't put the female in one of those plastic breeder boxes though, it can stress her out and cause her to lose her babies. You could get one of those fry nets that hang on the inside of the tank, and put her in there with lots of plants a week or so before the fry are due. When the fry are born you can take her out, and leave the fry in the net.