I tend to think that the lineage has something to do with it too. Some bloodlines are just stronger than others. I've had them in the past and did everything by the book and had nothing but problems. My strain now I've done everything the opposite and they're doing great. I keep them cool, low 70s with no problems. And breeding at that temp too. I did however lose my female as she jumped with the cover off.
I love these fish! As for no colour I disagree. They're black and white but my male has a bluish sheen on his back and the fins have a purplish copper irredescence to them. And as the male grows his caudal fin gets unproportially large and unpaired fins get that sickle shape. Awesome!
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