Blue tang playing dead habit

[Mohammad.ki]

Hello
I looking through internet about Blue tang habit when they " pleay dead " it will be leaning at sand ir rock , this every thing i found but i need to know this habit when it will be do and how much time blue tang keep leaning down i mean the period of keep laying and this habit it mean the fish scared or relieved , Because my large blue tang eating all the day and after eating all the day they leaning at the rock and keep this way for 8-10 hours from night till midnight once i add food they wake up ,so as i see my fish helthy no problem but why dowing that i get scared from it and keep thinking i am gussing wrong this habit every day untill now more than 6-7 days doing this , pleas advice me with your information about this habit blue tang for example this photo when they go to sleep they keep for 8-10 hours like this . i keep tracking it by recording camer

 

[Pickle_soup]

It's normal for Regals to do that. Mine use to wedge himself in rocks for the night. As long as he is active during the day and is eating well, breathing looks ok, I wouldn't worry about it. They are strange fish.