I think that your snapper is also just shedding and looks great to me. Mine also has some pink in him. As long as the spots you see on him are not white and slimy/fuzzy they should be fine. Just in case i would get him a turtle tank sulfa additive. They are made by reptomin and are in the shape of little turtles. Just put them in the water and it will maintain good skin health by preventing bacteria and fungus growth.