maybe not bad?

[gobywankenoobi]

This is the best photo I could get before it closed up.

It didn't look like a pest to me but probably going to nuke it anyway.

 

[bang guy]

Hard to say. Looks like Aiptasia to me.

 

[lauremf2002]

does it retract into a hard tube because it looks like the exact same thing I have. I thought it was a tiny feather duster. I also could not get a good pic b/c its so small.