I got introduced to endlers by someone on craigslist. The care is identical to guppies. They are thought to be a distinct species. Endlers will interbreed with guppies. To keep the species pure you should not mix with guppies. They are hard to find. Some aquarium stores sell them. Some places use them as feeder fish. They only get to be 1" when adults. The females are larger then the males. I started with a type called Black Bar endlers. They are really pretty with neon colors to them and look good with a dark gravel or background in your tank. Since they stay small about like a neon tetra you can have a nice group of them in a small tank. They are also good with Red cherry shrimp.
Right now I'm raising a Exotic Tiger/Hybrid endler pair. I rehomed all my back bar endlers on craigslist. This is a mix of wild endler and a guppy. The female is a guppy and the male is a endler. I was not able to find a Tiger endler where I lived but found a guy on E-bay that sells them. search endlers on e-bay. An other place is Aquabid.com. The place that has alot of different and exotic hybrids is swampriveraquatics.com
I found a web site that has a male Tiger endler that looks like mine
Tiger Endler pictures by yimes - Photobucket