Hermit Crabs with Barnicles

Hi,

I am in Destin Fl. this week on vacation and was able to catch a few
salt water hermit crabs. I am thinking these will make a great
addition to my sal****er tank (non-reef but lots of live rocks).

The problem I am having is a number of the crabs have small barnicles
attacked to the shell. The barnicles are hard cone shape with a hole
in the center.

Opinions about placing barnicles in a salt water tank? Sorry if this
is a dumb question I am new to sal****er aquariums.

John