every Naso I've seen behaves like a puppy. Easy to care for, too- they just need a lot of room. Tad might have a pair of Naso tangs..... but I don't recall seeing a pair @ Strong. (I think he has a couple of different species in that 1,000 gallon tank).
I know that I've seen pairs swimming together at the NEA. It's a kewl sight to see.