Hi,
I've got those humpedbacked limias as well. These guys will grow up till an average of 2 inches. They're pretty hardy. Easy eaters. You can almost feed them everything. They don't even have a problem with some lower temps.
Furthermore, they're easy breeders. The parents won't eat their fry.
These fish were general available during the seventies and eighties. Overhere where I live these fish re-entered the aquarium scene for about 7 years ago. But in a way, it's considered a rare strain these days...