Is this a Crown of Thorns Starfish

[Duboisi]

Noticed this hitchhiker on my live rock and was wondering if it is a pest.

 

[Daniel@R2R]

Bump for morning crew

 

[Duboisi]

I had a few responses elsewhere thinking it was a crown of thorns so I binned it.

Kean

 

[tyler1503]

How many arms did it have? Also, how big was it?
It could be a crown of thorns but my first thought on seeing it was it's an eleven armed seacushion.

 

[Duboisi]

It had eight arms and was about 1 inch across.