So when when I left this morning I fed the tank as normal and everyone ate, there were no issues at all. I come back 2 hours later and I see that my yellow tang is swimming in one spot of the tank but it’s breathing hard and swimming really lethargic (which I don’t know if that would be a word for fish). I call my lFS, rushed him there and he did the fresh water dip and moved him to a tank where we observed him. I have one other tang which is a purple and he was swimming fine even checking out the yellow kinda checking if he’s ok but they do from time to time chase each other but the purple is smaller then the yellow to dominate the tank. Now my question is the yellow was doing amazing this morning no issues then boom he’s swimming side to side breathing hard and freaked me out enough to yank him out the tank and rush him to my guy. At my LFS when we checked the yellow tang he had no abrasions, he’s nice and fat, no issues pretty much. Has anyone else ever ran into this issue because I am stumped and so my guy. Waiting on an update tomorrow to see if my yellow tang is fine.