Aptaisia?

[Jdeleon]

Or could it be a baby long tentacle? I do have some aiptasia I'm the tank but this looked a little bigger and looks exactly like my long tentacle. I found it stuck to the front glass. Its been moving around

 

[Joeganja]

Looks like majano

 

[Untamedrose]

Chances are way better that it be a pest then it be a plus. ...but no IDK for these photos