I think Untamed made a good point. Bioload wise you can probably handle both fish, but they both have potential to get pretty large. I was considering putting a naso in my 7x3 360g... but I just don't think it'll work out well once it gets large. I have really sparse and open rock work that's not going to lend itself to sheltering places for a 15-18 inch fish. On the other hand if I had plenty of large caves I'd probably go for it (both), especially if I had a 10' tank!