This past weekend, my wife and I had some people over and while sitting in the living room where the aquarium is located, someone commented on my "Dori" fish. The only thing is that I don't have a regal blue tang, I have a powder blue tang. I explained that I don't have a "Dori" fish and showed a picture of a blue tang on my phone so that they could see how different they look. Even after showing the picture, everyone agreed that they looked very similar, and my first reaction was "really?!" The reply was that they both have blue and yellow to which I replied, "so every fish that has blue and yellow on it looks the same?" After a couple minutes of describing all the differences, I gave up because I got the sense that I was making an butt out of myself. It was described to me that they only look so different to me because I am involved in the hobby and am more knowledgeable. But I feel that you don't need prior knowledge, but only eyes, to see that they are not the same. Anyway, I just felt like I was taking crazy pills and wanted to vent my frustration.