Crab probably from gulf live rock

[DylanE]

Found this critter sitting on a monti frag after light out. Currently in a container in the sump. Any reason not to leave him there? Looks gorilla-y to me

 

[polyppal]

Looks like a decorator? Generally reef safe if so

 

[Sumbub]

I think it's a gorilla crab. It looks hairy right?

 

[DylanE]

I think it's a gorilla crab. It looks hairy right?

Definitely hairy looking. That’s what led me to pull it.

 

[KQuillan]

When in doubt, pull it.

 

[ISpeakForTheSeas]

Hard to say for sure from the pic, but possibly the Hairy Coral Crab, Cymo andreossyi?

If so, they're somewhat parasitic on their host corals; in small numbers on big colonies, they're helpful, but in large numbers and/or on small colonies, they may kill the colony.

Probably Cymo andreossyi - generally not one you'd want in an aquarium, but at least somewhat beneficial in the wild:

https://aquadocs.org/bitstream/handle/1834/9351/Cymo%20andreossyi.pdf?sequence=1&isAllowed=y