I think they will take off that stuff from the shells when you introduce them to your tank ,They like to decorate themselve with there surrondings ,from what i know of that crab ,But they are cool watching them take off and put on new uniforms .as i would call it ,lolinline6 said:Giving you guys the heads up on decorator crabs @ FT for $9.99
Really cool diverse stuff on their shells like barncles, sponges, etc.