New Coral - Crab ID

[Hlothran]

Introduced my first set of coral to the tank and within an hour this small crab found it. Good or Bad??

 

[Flippers4pups]

Introduced my first set of coral to the tank and within an hour this small crab found it. Good or Bad??

Looks like a sea spider, but I need a better picture of it to ID.

 

[KJ]

Look like Majidae sp.