It must be a misbar, the other side is totally normal in pattern. The best news is that it is eating NLS 3mm pellets with all of the other fish. I had to move my flagfin angel into a 40 gallon section in my sump setup due to behavior. Best move I made. I really wanted a yellow belly, but I wanted a healthy eating regal even more regardless of color. So far so good. It gets along just fine with the majestic, emperor, blueface and flame. The powder blue and clown tangs left it alone after about 2 minutes. I had been wanting one of these for ever. Had a yellow belly that was just about ready for the main tank when the powerhead went out in the tank and there was no circulation. I didn't qt this one, but the store does treat full doseage prazi and copper all of the time. Same store I got my big clown tang from 3 years ago.