Is it possible?

[RobbieM]

My guppys gave birth around 2 months ago, I have let some of the biggger ones in to the main tank and have noticed somthing strange.
Some of the guppys have the same look as a neo tetra, is it possible the mother mated with my neons?

There well pretty!

 

[slamster17]

impossible neons are egg layers guppies are live bearers
two incompatible species of fish

 

[RobbieM]

impossible neons are egg layers guppies are live bearers
two incompatible species of fish

so what would explain the colours?