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I have some pregnant female Platys that are due to deliver this Friday as July 9th marks the end of the 28-day gestation period. In the weeks leading up to today, my Platys have had a black gravid spot. But last Thursday, after a water change, when I moved them to a giant 3 gallon breeding box, I noticed that on some of the Platys, the spot turned pink! Some spots remained black and some have both black and pink. What does this mean? I'm afraid I did something that made them abort their fry.
My yellow guppy fry were easy to sex pretty early because the females quickly developed noticeable gravid spots. I don't remember seeing that on other live-bearers, even light-colored ones. I haven't owned others though; I've just looked at them in stores. I separated my guppy fry as soon as I identified who was who, but although the spot is bigger on guppies who've given birth, it's obvious on all of the females. I'm just curious if other light-colored live-bearers are the same. Thanks!