How long has this tank been set up?
In my experience with my danios the females do not get fatter just before laying eggs. Now keep in mind that my danios are little fishy sex addicts and spawn at least weekly, often more than this. I have to assume that my danios are fairly normal, which tells me that if a danio is getting noticeably fatter overnight it's probably not from the eggs. My danios are fat, but they don't get skinnier after laying and fatter before hand.
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