Pszemol wrote:

These animals live hundreds of years in nature...
They die very, very slowly in our tanks if not properly taken care of.
Two months of observation is simply too short period to draw ANY
conclusions.
Similar slow death issue applies to many marine animals: sea cucumbers,
urchins, sea stars and some corals. They simply deteriorate too slowly for
an aquarist to know what is the cause of death.

Okay, I deserved that. but, I'll stick to what works for me.