Crab Id Please

[Floppyfish]

So I’ve known this guy came into my tank on some live rock. Wasn’t sure if he does any damage even though I’ve seen an acan torn on an edge. First I thought it was the gorilla crab I previously removed picking at coral. Today while feeding my corals I saw this crab reaching into closed acan polyps, ripped out whatever food they had and began eating it. Doesn’t sound good to me but asking for others opinions on it. To me looks like some sort of spider crab. Cool looking but if it’s gonna be a pain in the butt I don’t want it.

 

[NeSsyAqua]

Looks like a decorator crab

 

[Floppyfish]

Ya I thought that too. Just sent him off with a friend of mine anyways to play it safe.