I had the same problem with my Ricordea and some zoo's. My ricordea just shriveled up and died. my zoo's wouldn't open no matter where I placed them. I have a ricordea now in my BC29 and it's doing great. In fact, it was one the first corals that I got. The one that died was a blue and purple. Freaking pricey but pretty though. It's a shame my QT tank wasn't up yet. I've read some ricordea are harder to keep than others. Do you have a qt tank set-up? take it back to the LFS
where you bought it and have them hold it for sometime to see if it recovers. Maybe it's your lighting, maybe one of your fish is nipping at it, or water flow.