Black back is not genetic unless is is a het red axanthic I believe. There are normals out there with black backs that may or may not throw black-backed offspring, but it does not make them morphs. Correct me if I'm wrong but I'm pretty sure that's how it goes.

Here's my "normal black back" (paid $35)


That being said, I really like the normal black backs. Genetic or not, you have a very pretty snake there. Congrats on the new addition and good luck with the dinker project in the future.

edit: Another thing, why are you using 2 accounts for making posts?