blue guppy

I'm starting to wonder what kind of guppies I have, or if it they're an endler cross? The little male has developed some brilliant color. (I often see him shimmying his fins around a female, haven't seen any mating but both females are getting very fat and square, so they might have).

He's bright blue, darker on the caudal peduncle and black on the fins, with a line of bright spots top and bottom of the caudal peduncle like a row of runway lights.

Of course I could not get a good photo- the colors only show well when the tank is dim, and the fish flits around so much my camera can't really catch it.

But maybe, although blurry, these pictures give an idea.