Glad someone finally asked...
They are NOT hybrids. I spoke with Jeff Rapps of Tangled Up In Cichlids, who by the way is the ONLY importer of these fish....
Anyway the scope is a breeder Jeff knows from somewhere in Europe (I think) had a spawn from a regular pair of dempsey's.
When the fry started to put on some size, the breeder observed some discrepincies in a few of the fry so he seperated them.
As these fry grew he observed the differences from the regular dempsey.
To cut to the chase...the blue dempsey is due to a recessive gene that for some reason surfaced and gave us the blue dempsey.
Now I know this is far from a glowing recount of my talk with Jeff. If anyone wishes I would be willing to contact him again and get the full story a second time.
This was over a year ago that this information was passed on to me.
Here is a link to Jeff's site. He is a renouned breeder of S./C American cichlids and in my opinion an authority on them as well.
Jeff Rapps