never get lost like regular crabs, isn´t affraid for predators and I never seen attack somefish, also don´t have anemone on it, it´s just like a little ball with legs, looks like a blue spider with orange orings, I keep looking to make sure, isn´t dangerous, also a coral banded shrimp try to pull him a leg, and he still quiet, sometimes I think he´s die, but after that the crab just walk away a few inches, that´s why I´m sure he´s alive, only moves every hour just to change his location on the tank, it looks cool, a crab it never get lost on rocks