It's just a variety of guppies. The price sounds similar to yours except apparently to remove the heavy metals and chlorine from our tap water was have to add this stuff at the start then add other stuff for the next two days.
I want most pleased at the idea of my tap water having heavy metals in it!
I am hoping that the fish are hardy wee bastard when all this is over and they are in there!
HEAVY METAL? AWESOME! \m/