As long as your water parameters are good, I wouldn't worry. It's usually when they start bleaching or withering away that its worrysome. Also a gaping mouth isn't a good sign. Yours (at the moment) just looks like he wants to move.
Not yet, thanks! Still pampering, but just cannot get him to eat. No tiny baby shrimp, nothing. Any suggestion foodwise?Did this resolve itself? My anemone sometime acts like a crack head too.