Interesting... I had a Yellow tang when I first got into the hobby a few years ago. Wasn't that agrressive when I first got him, but after he was in the tank for a while, I could not introduce a new fish without him beating the you know what out of it. I finally had to give him away. I've been afraid of getting a yellow tang ever since, but maybe I just got one that had a bad personality. Thanks Floirda8 for your information. My gut is telling me to avoid the PBT and go with the Kole. I better listen to that, because everytime I've ignored what my gut has told me with respect to this hobby, I've always had trouble. Thanks agian for the info.