I don't beleive it is a pure Zo, I see no blue or any of the other typical coloring in them that my 7 in male has. But I do seem to see Zo in its face though. Yet I don't see any of the coloring that the typical BB has either. Except some red in the fins that both species carry.
I am gonna say that it is a cross with a Zonatus. What ever he is a monster!