Mine lost his crown and when it re-grew it never was as pretty as it used to. Now, a few months later, he is a goner
Never heard if Bworms eating them, but that would explain what happened to mine
If you don't see a crown floating around it may already been eaten by ur CUC or sucked up by filter?!
Give it time and observe. Maybe check water parameter...
Sorry it happened to you, they are beautiful. Miss mine :,(