blue throat trigger strange behaviour

[Gregs]

Hmm.. well tank parameters are stable and accurate for him but maybe im wrong:
Temp: 76f
salt: 1.025
nitrate: less than 10
ammonia: 0

tank is 220 fish only with live rock
-1 longnose butterfly
-1 small naso tang
-1 seagrass wrasse
-1 crimson starfish

I can see how these guys are quite timid so id understand if hes shy of new surroundings but it stumps me since he has came out many times into the open water and ate plenty of servings earlier... ? ive attached a photo of how hes been sitting for going on 3 days now.