Trying to figure out Red Axanthic?

[muddoc]

all het reds are black-backs but not all black backs are het red axanthics. if that makes sense.

Incorrect. All Het Reds are not black backs. The original Het Reds were black backed, and many of the offspring are, but I have seen Het Reds that are not black backed. I will agree with the latter half of your statement though.