Perhaps so, I have only cleaned X. conchyliophora from the Caribbean.  However,
I have some other species in my collection which have had attachments fall off,
both rocks and shells.
Leslie

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Maybe the species of Xeno makes a difference. The ones I've collect
were conchyliophora, which are among the sturdier species. Pallidula
and the like have delicate shells and likely their attachments are more
delicate?
Ellen

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