Warnings about this fish are not something to pass by...
I have had mine for like a month now. It has gotten more and more aggressive, and I don't know how bad it would be if I didn't have a Sohal twice the size of the Clown tang. Sohal is 12" now.
People say that the Sohal is aggressive, but it has nothing on the Clown!
My Clown hasn't actually done anything bad yet, but it sure makes it's appearance known. It chases away even the biggest fishes sometimes, even the Sohal. Well, the Sohal can take it down if it felt like it, but mine is rather calm fella
This is one of the prettiest tangs, but I would advise people not to keep it in a tank smaller than 400gal

I didn't plan to get one. It was thrown at me

I wouldn't get one now... I'm sure it will be trouble in few years time...