That looks like the typical Trapezia sp. crabs commonly found in stylos and seris and is a commensal crab - a good guy. If you have any other stylos and or seris etc in your display he will do the rounds at night staking his claim on every single piece for 10-15 mins and then move to the next one lol. He will live in the biggest piece in the best spot for food gathering from the current usually.
Look at the bottom of the page for your little guy.
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