They seem to just be a different color variant of a BGK. And as Lupin observed, it seems that you want to tell people how sensitive they are just because they died on you. This doesn't mean that they are sensitive. All the information you provided doesn't suggest anything about their sensitivity.
What was your tank size?
What was your filtration like?
What was your water parameters?
Temperature?
Diet?
Stock?
Did you examine them for parasites, infactions, ect?
You need to provide more detail on why you think these guys are sensitive. While there are fish species variants that seem to need more maintainence, like the Electric Blue Jack Dempseys, they aren't that big of a difference in care.