NO NO NO that is not an emerald crab. that is a gorilla crab. they are not reef safe. they are nastly little buggars that will get anything they can get their nasty little claws in. put him in the sump.
thanks guys ... hes a gorila crab... only this on is young smaller than a dime looks mor like the pic (auntkaren).....posted he is in sump and the rock i found him in aint in the refuge it had way too many hiding spots in it for him
do thay some times hid in the sand if thay cant find i place to hide???