Crab and starfish hitchhikers

[ReefingEd27]

Hello fellow reefers, I recently picked up a nice bubble coral from my lfs and there seems to be quite a number of hitchhikers. I'm not sure if they are nice critters for my nano reef or if they could possibly harm my corals, fish and invertebrates.
Here is a picture of a crab I found. It seems to have a brown head/body and white legs.

And here is a picture of what seems to be a starfish. Couldn't find an accurate Id for this so I'm hoping for the communities help

 

[Tahoe61]

The crab looks harmless at this size, my self I would keep him.
The brittle star is common small type star hitch hiker, they can come in a variety of colors but usually stay smaller than a silver dollar arm to arm.

Both look harmless and cool.

 

[FlyinBryan]

Agreed..harmless and congrats on crab! I really like the little stars they add to the ecosystem imo.