Guppy With A Droopy, Dangly Tail?

[fishboy2]

Hi there,
I'm a little worried about one of my female guppies as she has a very droopy tail. None of the others do, she is the only one. Can anyone tell me what this is please?
Many thanx.

 

[electric yellow]

What are your water stats?

I had a guppy with a droopy tail...unfortunantly she didnt last more than two weeks after i noticed it

there may not be anything wrong with her but guppys are sensetive.