I recently purchased two guppies from my local pet store and, to my surprise, found a stow-away! A guppy fry was also in the bag. So, when I got it home, I put it in it's own tank (probably .5 gallon or less) so my guppies wouldn't eat it.

Anyways, it's been about two weeks since I got it and it seems a tiny bit bigger. But I was wondering just how long it will take to grow into an adult. Right now it's very small, but there seems to be a little bit of color on it's body (pearlish tone) but other than that, it's still mostly white. Can anyone guess on how old it is from that information and give me an idea when I will be able to put it in the tank with the others? Thanks for any info you can offer me. Also, if you need anymore info about it, please ask.