As far as a Fish is a Fish, I have to disagree. Although maybe to an amature, and I am NOT calling you an amature, just trying to state an opinion. Maybe to an amature, just getting into the hobby, it may just be a fish, as they may not know any better, but many...not all, will develop a desire to learn more as they advance, and some of those who learn and care about the conservation will care about preserving a "true" species, according to type locale. As far as rede devils and midas are concerned, and I dont know at this moment were Rio Claro is, but if a river that flows into or out of Lake Nicaragua, contains a red devil type fish, then the ones in the river and the lake are most likely the same species, as they have access in and out of lake and into rivers, thus have the ability to breed with each other. Again my opinion is if it matters to the individual, it is ok. If you want pure or not. conservation is important though. As far as hybrids or cross breeds go, yes the seller should inform the buyer. This guy just wants an opinion, dont beat him down. Its all about opininions and he has a good question, we all do that is why we ask. As far as EBJD's go they are a selective breeding outcome and very INbred as well, that is why so many deformaties, because of no new genetic material, so rececive genes start to become the dominant feature because of no new blood/genetic material to keep those bad genes recesive. Hybrid are normaly the strongest of all becasue of so much new genetic material to keep all good dominant genes from both parents as fenotypical. I am not a fan of hybrids or man made strains, but I am just stateing a fact. Excuse my rant please.