I bought an orange one earlier this month. I acclimated it for over 3+ hours, very slowly. It lasted about a week then I found it in a collapsed looking state on the sand with it arm tips melting away to a whiteish stringy paste. I will try again though someday as it was really cool while I had it and from reading ophiura'a posts I learned many times these guys are doomed way before we ever get them home, no matter how carefully we acclimate them. So good luck!
Escape
:happyfish