Fry Pic And An Identification Question

[~heidi~]

Hi everyone,
  My Platy fry turned 1 week yesterday!

 Here is a pic I took of them last night.
I was also wondering if anyone can identify the fish in the second pic. A week or so ago I moved a couple of guppy fry out of my big tank and put them into the fry tank with the Platy babies.  This one baby looks different to me and I was wondering if this is maybe an older Platy baby?  It is slightly "chubbier" than the other guppy babies and it has 2 black stripes on its sides...
 
Thanx so much for looking and any help.

 

[helterskelter]

Blue platy

 

[~heidi~]

Thank you very much.