We have one in a 110 gal since 6 months. Maybe it is an exception, but we never had problems with him, he ate like a pig since the beginning, and he is surprisingly resistant to ich. I was concerned about its agressivity supposed to grow with its size, but until now his temper has not changed, and he is now almost 6 inches. He is very active, go crazy when fed, do some intimidation danses (it is quite a show!!), but never strikes. In fact our most aggressive is our scopas tang, and the only one that give real scalpel strokes is our big YT, but only if provoqued.
Good luck!