What, the Endlers or the Guppies? Most Fancy Guppies already have Endler in them, so they can get the fancy colors. That's normal. It's mainly that we don't want the few pure Endlers left to get hybridized, because there may or may not be any left in the wild. Even if they are hybridized, I'd still pick one because there is no need to hybridize them more.