ID help please

[Jennifier615]

This has evidently hitch-hiked into my tank on this rock. What is it?

 

[SmyrnaReefer]

aptasia?

 

[Jennifier615]

I don't think it's aptasia......This has a polyp style base that is red and white.....with red and white transparent thorny style tentacles.

 

[domb54]

looks like a rock nem to me but hard to tell from pic

 

[AC-WEB]

It kind of looks like a glass anemone, but could it be a small feather duster???