Species is
Microgeophagus ramirezi, and as for the breed, your on your own.
The shop I bought them from got them from a local breeder, and they were given no other name than "Golden Ram." Obviously, it's a balloon body shape.
Just to warn you, these guys are hard to acclimate to a new tank . . . Unlike Bolivians, they are shy, extremely sensitive to different water chemistry, and easily intimidated by tank mates even slightly larger than themselves. I believe this is a man made color strain, and like bettas, they are less hardy as a result.
I had 2 of the balloons originally, but one died. The other was doing badly too, because my 20 was less densely furnished at the time. Fortunately for the ram, I was starting to finish furnishing my 5 gallon display tank. I quickly moved the ram to the new tank, and began to go through great effort to help the little guy. Here's what I did:
- DENSELY plant the tank (these guys NEED hiding places even if they don't hide, caves greatly appreciated)
- Smaller tankmates (at first, the only other fish were ember tetras which are .5" long, and 2 cory sterbai)
- Fed live Brine Shrimp (favorite food)
- was VERY anal with water perameters
It was about a month before I saw him any other time than feeding, and he was still pale. But (this is what I love about rams), it all pays off once he claims the tank as his territory. His colors started to intensify, until you see the color he has now, and he's almost always about the tank, strutting around. He's really the tough guy of the tank now, and acts like it. Really great fish. My favorite actually.