Not only that, but you are not supposed to mix two ghost knives. They will stress each other out and more than likely one is going to end up dead in the future.
I also see some of your fish becoming snacks, Cleo. Here is a vid for you:
[media]http
/www.youtube.com/watch?v=sZO_wyslrVE[/media]
I know this isn't entirely relevant to the OP, but hopefully it'll help dissuade the OP from getting one as well.
OP, I think your gourami is a perfectly fine centerpiece fish, and I think you'd see better behavior from your others if you upped their numbers.
*Edit* Asking this, while I don't feel quite comfortable with it..could the OP rehome their dwarf gourami, and get a larger kind, such as the golden? They're supposed to reach 5-6in which sounds like what her hubby wants.