Awesome. I wish you the best of luck. I have been attempting this for the last year or so. I purchased 4 blue gene "pink" dempseys from Florida at about 2-4in. 2 males and two females surprisingly. None of the fry they produce survived more than a couple of weeks in the free swimming stage.
(OK not thread jacking here, I've just tried to find a straight answer from someone and after researching several 5-10 year old articles I've decided to just figure it out myself. This is the first time I have seen someone posting something this similar and of course, this recent)
Those fry look a lot like gold fry (though admittedly I've never seen platinum fry).
I hope that they have some blue in there
Without be able to produce fry that would survive I ended up breeding on gold (blue gene) with regular demsey male just to see if they would produce. Big batch that I have moved sold, fed to other fish, but I have about 30 fry that I guess are Gold gene and considerably lighter in color, but still look like light colored regular dempseys.
Now that I knew they can successfully produce offspring I got a couple of "blue gene" females. I have about 120 free swimming fry (about a week) and they seem to be doing well (gold blue gene male and blue gene female). Now if I get any electric blues, I would assume that they would be electric blue, gold gene.
The fact that my golds cannot create fry that can survive ultimately led to me trying to deepen the gene pool a little, and also wonder if it has anything to do with these double recessive genes or inbreeding to attempt to produce platinum (apparently they were a part of a breeding program that was scrapped because it was taking too much space)
Very interested in what you come up with. At the very least you are helping to clear some of the misinformation and rumor to breeding some of these fish.
Please let me know if I/my fish/tanks/ can be of any help.
Thanks