Live Rock Hitchhiker

[Alexis56]

I've had this nano reef aquarium for about 7 months now and just noticed this on my live rock. I'm assuming its a starfish with one leg and 5 more coming, but I'm not positive. It's a light grey color and moves extremely slow. If anyone can identify this, I'd really appreciate it! Just want to make sure it's not a threat to my corals.

 

[mr_X]

It appears to be an asterina starfish. Generally safe.
Starfish: Considerations for the Common (and Commonly Misunderstood) Varieties by Anthony Calfo - Reefkeeping.com