Re: A little insight please,
From what I understand of genetics, a co-dom will give you the same odds as a dominant morph if it's the only one carrying the gene in the pairing. So you might get some normals and some granites. The only difference between co-dom and dominant is that a heterozygous animal with a dominant gene looks the same as a homozygous animal with the same gene, whereas a heterozygous co-dom looks different from the "super" homozygous form.
I don't know if granites are dominant or co-dominant, but from what I know, you'll get the same odds.