1 more tang...too many fish?

[Aquattro]

Wendell, when I read something like that, I do adjust for the individual fish. My first tang, a yellow, went in my 45g tank. Which, BTW, had a lot more swimming room than my 75g. So is the bigger tank better? Not this time. The tang is now in my 155g, and still as happy as when it was in the 45. It isn't now nor will it ever be 7.9 inches long!
I think the book is a good baseline with which you form your own opinion.