Drew, I really think you should do what's best for you. Take it slow and I truely believe you will be fine. I'm really surprised there are so many objections on here about having 3 tangs in a 6' long tank, when you see people with 75 gallon tanks that have had tangs for years. Not that I personally would do it, but a 6' tank is going to be enough room, but I wouldn't do more than three. You can also do what many do and get them small, like 3", and when they start to get to big, like 10" then trade them for new ones. Take the info you are given and then make your own decision. You sound like you care a great deal about your fish, so I'm sure you will give them a great home, no matter what the size. A person can have a 500 gallon tank, but unless they take care of it the fish, no matter how big or small, will suffer.