I recently got a small 3-4 inch blue tang 6 days ago and he is still not eating. He will mostly hide under the rock every time I try to feed him with the nori clip or brine shrimp. He also has some type of white rectangular line on his nose, not sure if it's ich because it didn't look like dots. Is it normal for them to not eat for this long when new? My parameters are fine as well. What should I do?

