Concerned about the behavior of my Biota yellow tang

[Qihan7]

I just introduced four anthias two days ago. Although I didn't notice any aggression from them, my yellow tang started hiding all the time and not really eating anything. What should I do about that?

 

[Tired]

How big is he, how big + what species are they, what else is in the tank, how big is the tank, and does he eat if you use a turkey baster or such to send food directly to him?

 

[Qihan7]

How big is he, how big + what species are they, what else is in the tank, how big is the tank, and does he eat if you use a turkey baster or such to send food directly to him?

four blue eyes anthias 4-5cm, yellow tang is about 4cm, and the blue tang is about 6cm. The tank is about 60g. Not never eat nori

 

[Tired]

I would suspect the blue tang might be causing problems. That tank is too small for most tangs long-term, especially a blue tang, and I'm not sure at what point the blue will start feeling cramped and getting aggressive.