How about posting a picture of it?
We have a white anemone crab and a blue porcelain crab and they are both harmless little guys. The anemone crab is a little more feisty and will take mysis shrimp with his claws. Sometimes he waves his claws at the fish, pretty comical.
The blue porcelain crab found a spot in the flow that he likes and has literally stayed put for months.
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