I only have the blue tang, the tomini and the little naso. I have plans to get one more, probably when I get back into town next week.
I got the tank bug about 3 weeks after i set up my first tank, which was a 29g.
I went to a 55g cause I thought it was enough for a yellow tang and when I found out it wasnt I went to a 125g.
Not sure which tang I will add next, liking the whitecheeks but another yellow might be in the cards.