Let's get right back to the facts instead of the miscellaneous misconceptions Marginatus. Endlers are not extinct in the wild. The site where they were originally found in the Laguna de Los Patos has significantly degraded since they were first discovered and the local population in that particular location may have been lost, but nearby creeks and streams have been found to be teeming with endlers. The species maintenance program originated by the endler association in the US and also carried on by people in many other locations are keeping fish derived completely from wild endlers. I am a registered breeder of wild type endlers myself, which we call class N fish. Almost anything you find in a fish shop is a cross between endlers and guppies, because breeders found they could sell far more fish by crossing them than by maintaining a pure population of endlers. Unfortunately, pet shops and the breeders of these hybrids have chosen to call them endlers instead of calling them hybrids, which confuses not only you but lots of other people. There are no guppies in my population. Guppies are not even allowed in the same room in the house as my endlers. I have a simple Guppy
tank in another part of my house for my wife, who likes her guppies, but they are not allowed in my fish room. It is simply too easy to accidentally move a fry from one tank to another when it is hitchhiking on a net.
My 45 gallon tank holding one of my endler colonies.
The 29 gallon tank that houses another endler breeding colony
By keeping 2 separate populations breeding in my tanks, if something happens to one, such as a disease getting into the tank, the other is there to carry on.