I bought the clam at CFM last year, didnt do a long drip acclimation process. i put it on the plastic cap and leave it on the sandbed.
So far, it still survives and happy.
Maybe yours not happy b/c of the mushroom touching it.
Its hard then. When i went to the Reef show last weekend, some vendors told me its a jelly bean. And some other vendors show me a similar one and told me its a rainbow chalice. And I end up buy this Jelly Bean.
when i read this : https://www.reef2reef.com/threads/wwc-jelly-bean-chalice-coloration.714927/
It seems Jelly Bean chalice is different though. Maybe i'm wrong