I want to give my Hermit crushed Egg shells. But How do I prepare it?

ok ella was rude. anyways here is how. i heard it doesn't have to be boiled. you can just take the yolk out clean the shell with water no soap and then crush the shell into pieces. and give it to the crab. but if you must boil it you can boil an egg and peel of the shells and give the shell to your crab :)