That's real nice to hear.
I always doubt myself and probably shouldnt as much, but that's maybe why I have had some success with my tanks and stocking so far. When the 55g was my biggest SW
I was so tempted to get a yellow tang like you wouldnt believe. Just a small one mind you, but I almost did it. I;m really glad I waited now and trusted my gut on that one. lol
My gut tells me a tusk would do fine in the 90g as long as I don't go crazy with the rock work. I really would like to make a tall structure out of it but I was checking out my base rock today and not looking good for that.