I think shes had babies

[poohbear]

One of my female guppies looks a lot thinner than I remember but we cant see any sign of fry in the tank.
She still has a gravid spot so could she have had some and there is still more to come.
My other female is still really big and her gravid spot is starting to look a reddish color.
Hope I find some fry

 

[GuppyDude]

yes she probably had them, if u'v checked real good and cant find any they've probably been gobbled up by mama or watever else u got in ur tank, iv had guppy fry hide from me for about a week and survive so u may see some come out l8er the love to hide

 

[pnyklr3]

On a hunch, and to my own surprise, I once removed the media from my filter and found about 4 fry living in there! Depending on how your filter moves the water and how big the opening is in the tank, I would check your filter.