HELP please, Den. burana jade

[Carpe Diem]

I bought the plant about a week ago at a Florist. I am stumped! What is this hard thing the Den. is pottet in? A coconut? I can't put it in bark, because the roots have grown into the shell. The other problem - the leaves. So far 4 have fallen off, one sick one is still attached to the cane, but I'm sure it will fall off tomorrow. Once they get ugly looking they fall off very quickly. Is the plant virused? I am very worried! The flowers don't open either, they have been at this stage since I've bought it. Actually, I am shocked at how quickly the leaves turn sick and drop. I am hoping for a fast reply, in case it is a virus.
Thank you for reading and any replies!