Orange Linkia

[EMUreef]

I added an orange linkia about a week ago that I purchased from the guys at Trop it looked great. I acclimated it over about a three hour period and then added it to the tank. Seemed to be doing well for the first few days was moving around the tank slowly. Yesterday is seemed to look a little odd...kind of shriveled up. Today it looks even worse. It movies very slowly and an arm came off. Not sure how it came off. Is there anything that I can do for it?

Thanks

welp big question is how old is the tank? I've also heard that star fish arn't suppose to be exposed to air, but i dunno how truthful this is.

big this is stars need an established aquarium to survive.