04-18-2012, 01:11 PM
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They don't look to me like they're "about" to give birth, but they're probably pregnant. Female platies, if housed with a male, will give birth almost once a month.
I have 2 female platies with a single male platy housed in a 10 gallon tank with a female betta (and a couple cories, but those are irrelavent). They give birth often - I've barely seen them not pregnant.
RIGHT before they give birth, they'll usually get very skiddish and hide in weird places - wedged up against the glass next to a plant bulb is where I tend to find mine.
I have had 3 baby platy survive past the point of being eaten in 6 months. I don't breed them or use a breeding box or net, they're just good hiders. It depends on how many platy you really want. The female platies release a hormone that prevents them from eating their OWN babies for about 24 hours. After that, it's game on. One or two might survive.
YOu don't say how large your tank is, but I wouldn't say it's overflowing with hiding spots for the fry. That being said, they are great hiders and you'll probably get lucky with one.