Hi I got my long snout Butterfly fish yesterday and I noticed a white kinda puffy spot (or maybe damaged scale) on him this morning. He seems otherwise happy and eating well. New to this and not sure what it is or what treatment to use? My water tested good at LFS when I got him. Everything else seems good in the tank except I also got my first coral and that seems to be covered with copepods but that’s a different question for another thread