Help with hitchhiker ID?

[LightBrownPillow]

I've got what looks like a tiny, double-amputee sea star (3/5 limbs) in my new marine tank. It surely came in on my live rock. I never see it move, but over the course of a day it will be in multiple locations on the tank glass, pretty sure it's detaching/drifting/reattaching.

Can anyone name this critter or give me some details? I'll not worried about it's presence, just would like to know more.

 

[Daniodude]

To me it just looks like some kind of baby sea star.

 

[saltwater60]

Asterina star fish. No need to worry about it.