That's a gorgeous Dovii.
I notice he seems awfully calm and unaggressive though. What size is the tank? IMHO you should move the divider over and give the male a bigger swimming area than the smaller female. Maybe he's depressed since he won't even attack you when you put your hand to the glass.

Or do they get less agressive when they get that big? Mine is about 13" and goes nuts if I put my hand on the glass like that.