Crab Living in acropora

[snake]

Hello all

I added yesterday my first colony of acropora, it is my first atemp to keep sps corals, it is a brown acropora, I just found a crab living inside de acropora and I'm worried because I don't know if this little guy is safe for the acro or not. what I'm sure is that it is not a porcelain crab.

I could not get a clear picture for the id, but it is a small brown hairy crab it looks like it mimics the acropora polyps.

Please advice