Sick sunset anthia

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Hey was hoping I could get a little advice with this new fish that just came in two days ago. As soon as I got him he was not doing so good and was laying on his side on the bottom of the tank. He has improved since then BUT is still not doing so hot. My other fish is happy and swimming around but not this guy. Here is a picture and a video

How should I treat this guy??? I have antibiotics, should I give that a shot??? Maybe shipment was a little so much

 

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I've had really great luck with anthias recently. I have queen anthias as well as 8 others. I hope I can help him

 

[C. Eymann]

Considering you are successful at keeping pseudanthias tukas, I assume you know anthias husbandry quite well.

Could be a swim bladder issue? it is it eating? if not, priority is to get it eating before treating with antibiotics/meds

 

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He won't eat... just sits on the bottom. Have you ever had a fish do this after you received them in the mail and servive??