Interesting Hitchhiker on live rock

[Ming36]

Find this little guy (w/ eyes, month and legs) using its front legs to filter food from water, hidden in the live rock. Any one know what it is?

Image is not quite clear, I also take a short video: https://youtube.com/shorts/bI8b9PBA9Rc?feature=share

 

[Anemone_Fanatic]

I'd say porcelain crab. Reef safe if so.

 

[Mark Goode]

+1 porcelain crab. Reef safe & cute.