Fustrating foxface behavior

Heyy guys, i have an foxface and he has been so fustrating he keeps swiming from side to side really fast against the front glass of the tank if checkt and tested the water parameters nitrite and nitrates is fine and close to 0 and ph is fine and oxigen if also checked is also fine i cant figure out why he is doing this if any body can tell me why he is doing this and how to stop it ill really apriciate it

 

How long has he been doing it? What fish you have in your tank? Mine did the same and in my friends tank but stopped a week or 2 later.

 

Mine did the same for about 2 weeks. He was see his own reflection in the glass but gave up eventually chasing the other foxface☺

 

if had him for about 7 months i also have an moorish idol,cleaner wrasse,vagabond butterfly,clowfish,and a bicolour angelfish his been doing it for the hole week now

 

Something might have given him a fright. Add any new fish recently? As long as he is eating he will be fine.

 

yeah added an bicolour angelfish he is eating well he also loves seaweed

 

He might be skittish about the new addition. It will blow over, just give it some time...