Allright, I'm not a fish breeder, but I adore those guys!
I had one when I was a little kid and that was one of my first very own fish
They are very hard to get where I live. I've been searching for them for almost 10 years!
Then today finally got two fine, young Bubble Eye goldfish

Bubble Eye are a small variety of fancy goldfish with upward pointing eyes that are accompanied by two large fluid-filled sacs which grow as the animal ages. They are vulnerable because of those, so they need to be kept away from any sharp edges and agressive fish.
They are probably the most scandalous goldfish species of all.
Mine live with my regular young goldfish.

http://sapphiresenthiss.deviantart.com/art/Bubble-Eyes-571790250