They are co-dom/dom not hets.
They reproduce in a co-dom/dom manner. In the proven line there is visual animals and normals. The project is confusing enough without any outside confusion about hets.....

There are a lot of markers to look for, and just because a animal looks like a black belly does not mean it is.

We produced a spotnose black belly poss het axanthic this year as well so things are looking interesting for the next few seasons.