As usual, very nice photos, especially the butterfly and the urchin. I recall seeing a "yellow tang" (actually this is the juvenile coloration of the blue tang, a super-common fish in the Caribbean) once or twice while I was snorkeling at the Destin jetties a few years ago, so they are around. They are just not common in the northern Gulf. In addition to their yellow color, they have a very pretty blue circle around their eyes.