Unknown And Sudden Guppy Death :(

[BellaAndAngel]

Ok, on saturday morning I woke up and saw my female guppy swimming at the bottom of the tank, I thought she was going to give birth soon. So I turned my filter down to half way so it would be easier for her to rest. I then left to Canberra. I came home today (Sunday afternoon) and she is struggling to swim, like up to the surface then sank back down without a fight. I then spotted 1 baby guppy, I saved him. I noticed the sick guppy still looked REALLY fat and so I separated her, she only got worse. She stopped trying to swim, no fins moving at all. I then saw her at the bottom of the tank laying slightly on her side, I got the net and gently moved her, she didn't respond, at all. I figured she had died. I gave her the traditional fish burial. But now I'm wondering, why didn't she float? Was she really dead? Help please, I'm so upset... My first fish died today

 

[WILDER]

Always check the gills are not moving.
R.I.P.

It didn't sound to good i'm afraid.
I thought the fry might of been pressing on the swim bladder, but it sounded like it was more than that.
How are the other fish doing.

 

[BellaAndAngel]

How are the other fish doing.

The rest of my fish are completely fine. None of them seem to be struggling to swim or anything.

 

[WILDER]

That's good news then.
Sorry about the other guppy.