I agree with Chuck; the tang family needs a giant tank.
Felix-You've been in saltwater for 10 years? Awesome.
As you know, that of 1 fish per 10 gallons rule isn't always accurate. It depends on how mature your tank is, what type of filtration you have and the fish that are involved.
Tangs are a big ol' fish that need lots of swimming room, just something to consider; there are a few that have a 70 gal min. you can check out on liveaquia. But, yeah, they need fed a few times a day and lots of algae, not sure how long yours has been set up.
I really, really, want to eventually, after getting my 60 going for a while, get a Kole Yellow Eye tang. But, I know that day is a long time away :)
I think for the most part, those of us with tanks under 90 should stick with other varieties.
I'm sure others will chime in....