How fast do these things grow? I bought one recently for 15.00. He was 1 inch when I got him 4 weeks ago. Hes almost tripled in size. Its hard to believe but I swear he gets bigger everyday. At the rate hes growing I'll need a new tank soon lol or I'm going to have to sell him off. I don't expect to be getting a new tank till next year. Was hoping he'd grow slower XD.
Tangs grow fairly quick... Almost all fish grow quick up to a certian size and then it kinda tapers off... I would figure at about 4 or 5 inches he will taper off to a normal growth pattern of about an half to an inch a year. Its important in the wild that these fish grow out of their juvi stage rather quickly. I got a shock myself the other day, I had been down for about 2 weeks and not able to take care of or even care less about going into my fish room and looking around. (Thank god for the wife) but when I did finaly go out, I looked at three orange line chromis that I had bought, all were really small and young, within those two weeks they had completely put on their adult dark colors and I swear they had grown an inch. Its things like that, that keep me interested in the hobby.
Tangs grow at different rates. Chances are you've got one that's going to continue to grow quickly and they can reach lengths of 14". You're more than likely going to have to find a new home for him soon. Tangs like to swim so they need plenty of room.