What is this? Should I be worried?

[ReefGrrl]

Noticed this on the glass a few minutes ago. It looks like a tiny pink snail with a bunch of knobbly legs radiating out. It's on the glass and actually has a piece of red seaweed clutched in it's, um, legs/tentacles/arms.

Should I be worried? I think it might be some sort of hydroid but even after searching for about an hour I can't find anything that looks exactly like it.

I'm sorry the photo is so blurred - I love my ipad camera except when I hate my ipad camera - depth of field is a crapshoot. And the real camera has dead batteries.

Can anyone talk me off the ledge? Or make any eradication suggestions? I just looked again, thinking I might try another photo but it's nowhere in sight now.