5teady_2012
Here to help
Just to add to my last post, when using treatment, if you add a bit of aquarium salt, it will boost the medication 
it's 23274643624789643% male!here is what the petstore sold me as a female guppy, its not exact pic but its the closest i have seen.
14 day garuntee
In the UK your lucky if you get 24 hour garuntee

i am under 18
Dosent worry about age thouhg. Im 14 and i consider myself a skilled Aquarist. If it dies, take it back. You do have a 14 day garuntee dont you?
although my friends think im weird for it though lol 
lol, you can see its fish-like-penis and you ask if its female

Original poster, you can't tell a guppy's sex solely by the way its coloring is. Finding a picture that looks like yours doesn't count.you can't tell a guppy's sex solely by the way its coloring is.